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This question is similar to "how many kanji do Japanese natives know?" but a
bit more specific, because I'm particularly interested in the jinmeiyō kanji.

My understanding is that they are the kanji commonly used for people's names.
I am not clear whether the jōyō kanji are also used for names, or only the
jinmeiyō kanji. That's part A of the question.

Part B is whether Japanese natives generally know the readings for all the
jinmeiyō kanji, such that when they see someone's name in writing they
automatically know how to pronounce it without furigana. Is it common practice
to have to ask what the name's reading is? Do people ever use furigana for
names, like in books where you obviously can't ask the characters how to
pronounce their names?
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names
Is it always necessary to ask how someone's name is pronounced if you encounter it first in writing?
Regarding whether you should ask people about the pronunciation of their
names, pretty much yes. With only the kanji, it could actually be very hard to
read names correctly. Many names have multiple readings. For example, the
surname 高城 could be pronounced either as たかじょう or たかぎ. The name 陽菜 could be
pronounced either as はるな or ひな. The common female name 玲奈 could be pronounced
as either れな or れいな, and outrightly mispronouncing one's name could offend
some. Of course, if the person's surname is rather regular, such as 高橋｛たかはし｝
or 田中｛たなか｝, there is usually no need to ask. But, in general, only the person
him/herself knows the pronunciation of their name for sure and others should
always follow him/her i.e., even if someone is named 一二三 and want you to read
his name as ドレミ, トランプ or even バカ (although I don't know why one would do so),
you should call him so.

So,

**Part A:**

人名用漢字｛じんめいようかんじ｝ refers to kanji that could be used in names **which are not
_jōyō_ -kanji**. 常用漢字｛じょうようかんじ｝ are also valid kanji for names: otherwise,
simple & common kanji characters such as 花 and 子 would not be valid in names,
which is absurd. The Japanese Wikipedia page on
[人名用漢字](https://ja.wikipedia.org/wiki/%E4%BA%BA%E5%90%8D%E7%94%A8%E6%BC%A2%E5%AD%97)
is a rather good place to learn more about 人名用漢字.

In fact, however, 人名用漢字 consists of many quite common kanji that aren't part
of 常用漢字 for some reason. One example would be the character 遥, which is very
common in female names, but also in the word 遥｛はる｝か "distant". Also, many of
the 人名用漢字 are simply variants of common _jōyō_ -kanji. For example, the
unsimplified form of 桜, i.e. 櫻, is part of 人名用漢字 (partly because the character
桜 is considered misfortunate for names due to its number of strokes). 嶋, a
variant of 島, is seen in surnames.

However, note that sometimes kanji that are neither 常用 nor 人名用 CAN appear in
surnames. For example, the common surname Watanabe 渡辺 has two old-fashioned
variants, 渡邉 and 渡邊, which are still common. However, neither 邉 nor 邊 is in
人名用漢字.

**Part B:**

The answer is, NO. Many 人名用漢字 are actually rather rare even in names, and
people generally don't know how to read them. However, even if the characters
are rather common, they might have special readings in names. For example, the
surnames 五十嵐｛いがらし｝ and 我孫子｛あびこ｝ contain no rare characters, but their readings
in these surnames are quite eccentric.

In Japanese TV drama, anime and manga, it is common to present characters'
names with furigana when they first appear. So, no, it is very common to give
furigana with names. When you register for accounts on Japanese websites (go
to Amazon Japan and see!) or fill in forms such as customs declarations in
Japan, there will always be a space for フリガナ of your name. Thus, it is never
strange, and kind of actually mandatory, to provide furigana for names.
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answer
## Part A

常用漢字{じょうようかんじ} (Jōyō Kanji) and 人名用漢字{じんめいようかんじ} (Jinmeiyō Kanji) are two
separate and non-overlapping lists, but Kanji used in a person's name can be
from either list. 常用漢字 are the most common in names as well as in general, but
because Kanji used in many names are more unique and diverse than these more
common Kanji, the 人名用漢字 list was created so that people could use these more
unique and diverse Kanji as their legal names.

For instance the 人名用漢字 list contains "alternate forms" for Kanji that are also
on the 常用漢字 list. But it also contains Kanji that are not on the 常用漢字 list at
all.

> For instance, 「櫻{さくら}」is an alternate (in this case the un-simplified) form
> of「桜{さくら}」which is included on the 人名用漢字 list. So you are free to use either
> character in your legal name. But you should not write the _word_ "sakura"
> with the alternate form in a public records or communication context.

The point of the 常用漢字 list is to restrict the number of Kanji that are used in
public records and communication, like driver's licenses, television,
newspapers and so on.

The point of the 人名用漢字 list is to accommodate people whose names include
certain Kanji that are somewhat common, but only in the context of people's
names.

That being said, most of the 人名用漢字 are not common at all and are not studied
in school as a requirement the way that 常用漢字 are. However, in the context of
historical figures whose names include Kanji outside of the 常用漢字, 人名用漢字 would
be used.

## Part B

Generally speaking a Japanese person would only be familiar with Kanji on the
人名用漢字 list if they know people or characters who have names that include Kanji
from that list.

Names in books can use any Kanji from either list. However, even with very
common 常用漢字, names can be difficult enough to read to warrant the use of
furigana.

For instance you may see a character with the last name 東雲{しののめ}, where both
of the Kanji for this name are very common ("east" and "cloud"), but the
pronunciation would be unfamiliar to many people.

Also, it bears noting that regardless of which Kanji are used in a name,
ultimately the pronunciation can be almost anything. The way this works is
that when a name is registered (like for a new-born baby) there are two
separate fields, one for the Kanji used in the name and one for the Kana that
is used to pronounce it.

[![enter image description
here](https://i.stack.imgur.com/lHTiX.png)](https://i.stack.imgur.com/lHTiX.png)

And yes, it is very common and polite to ask how to pronounce a person's name
when you see it only in writing, even if it is a common one.

  * If you see a common name like 山本, you may say 「ヤマモトさんですね？」or more politely, 「ヤマモトさんとお読みしてよろしいでしょうか？」
  * If you see a name which may have more than one common pronunciation like 林, you may say 「ハヤシさんでしょうか？」or more politely, 「ハヤシさんとお読みしてよろしいでしょうか？」 
  * If you see an unusual name like 劉, you can say「何と読みますか？」or more politely, 「何とお読みすればよろしいでしょ‌​うか？」
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answer
**Part A** : Jinmei-yo kanji is the list of kanji that can be used _in
addition to_ Joyo kanji when you name a baby. See the other answers.

**Part B** : No, we don't ask the readings of people's names often. Most kanji
names have only one reading, and native speakers know the reading of lots of
kanji names. For example, as far as I know, 田中 is always たなか and nothing else.
Generally speaking, in 95% of the cases or so, it is possible for a native
speaker to correctly guess the reading when they encounter a new name without
furigana. Even [jukuji-kun](https://japanese.stackexchange.com/q/24513/5010)
names such as 東雲, 東海林 and 五十嵐 are not really difficult to me.

However, some names do have rare alternative readings. While 中島 is almost
always なかじま and you don't usually have to ask how to read this, you may
encounter a person called なかしま (with unvoiced し), say, less than once in a
decade. Instead of always asking "Can I call you なかじま?", people would usually
just call him なかじま without hesitation. Most なかしま-san must be used to being
mistakenly called なかじまさん, and they usually politely say "なか **し** まです。" ("I'm
Naka **shi** ma").

Of course there are rare times when we encounter really difficult names, and
it's perfectly fine to directly ask what the reading is in such cases.

In a book, the romanized or hiragana name of the author is often available in
the profile or copyright section of the book. If the reading is really unique
and the editor is kind enough, the reading is often available on the book
cover as part of the design. For example, the reading of the author of _Attack
on Titan_ is rather difficult (諫山創 = いさやまはじめ), and here's the cover of his
book.

[![enter image description
here](https://i.stack.imgur.com/KbntU.png)](https://i.stack.imgur.com/KbntU.png)

Other examples:

[![enter image description
here](https://i.stack.imgur.com/8gXP7.png)](https://i.stack.imgur.com/8gXP7.png)
(冲方丁 = うぶかた とう)

[![enter image description
here](https://i.stack.imgur.com/MZPRX.png)](https://i.stack.imgur.com/MZPRX.png)
(虚淵玄 = うろぶち げん)

[![enter image description
here](https://i.stack.imgur.com/0F3zV.png)](https://i.stack.imgur.com/0F3zV.png)
(日日日 = あきら)
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