When people's names are listed with both sides aligned (either in horizontal
or vertical writing), for example, in the ending scroll of a movie, there is a
seemingly complicated rule (to me).

When the length of the name (family plus given) is not three characters, the
positioning is such that the characters are distributed evenly, without
particular segmentation between the family and the given name parts:

> X* = family name, Y* = given name
>
> X Y  
>  X Y Y Y  
>  X X Y Y  
>  X X X Y  
>  X Y Y Y Y  
>  X X Y Y Y  
>  X X X Y Y  
>  X X X X Y

However, when the length is three, it seems as if a space character is
inserted between the family and the given parts and the positioning is done
counting in the space character, like this:

> X Y Y  
>  X X Y

Considering the rules for the other cases, I would rather expect:

> X Y Y  
>  X X Y

Why is it like as is? Is there a rule behind that makes the length-3 cases
non-exceptional, or is there a reason why length-3 is exceptional, or, is it
just due to inconsistency/stupidity of whomever started it?

**Edit**

Or to see it from the other side, it is natural that a space be inserted in
between the family and the given names (as Dave points out in the comment).
Then, why are the cases other than length-3 (except the length-2 case, which
can be interpreted in either way) not having a space? I would rather expect:

> X Y Y Y  
>  X X Y Y  
>  X X X Y

and so on.

**Edit** These are links to some pictures that describe the situation (with
some variations):

  * [picture](http://static.panoramio.com/photos/original/59902844.jpg)
  * [picture](http://static.panoramio.com/photos/original/62534614.jpg)
  * [picture](http://blogimg.goo.ne.jp/user_image/0e/fa/4443ef48816f46ec3daedcb65cb1681c.jpg)
  * [picture](http://dictionary.sanseido-publ.co.jp/dicts/encyc/concise_name_wd/img/gaijin_tyosa.jpg)
  * [picture](http://dictionary.sanseido-publ.co.jp/dicts/encyc/edo_study/img/edo_tokyo_sinso_sippitu.jpg)
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question
names typesetting
Alignment of people's names
What if the rule is "Do not insert a gap that is larger or equal to one
fullwidth space (sometimes used to separate names), unless it breaks up the
family name and the given name"?

Names with three characters put a larger space before/after the one-character
name, in order to make the spacing between the characters of the two-character
name smaller than one fullwidth space, so that it can be read as a single name
more easily.

Names of four characters or longer are long enough within the typeset area
that the spacing does not need to be adjusted - the characters are close
enough together for the name to be read naturally.

I suppose that if you can find an example of a credits screen where the
typeset column for names is so wide that even four-character names have
greater than one fullwidth space between the characters, it would shoot a hole
in this theory.

(I also agree with Dave's assessment that "length 3 names are the hardest to
parse".)
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answer
_Making my previous comment an answer, since it turns out to be not as obvious
a suggestion as I thought_

I think we can all agree that the particular spacing makes it easier to read
the 3-kanji length names, so the question is why this is done only for 3
kanji.

My personal guess is that this is because 3-kanji last+first names
combinations are particularly hard to "parse", compared to other lengths:

  * 2 kanji is trivial

  * 4 kanji is statistically very likely to be 2+2 (considering how much more common 2-kanji names are than 1- or 3-kanji).

  * 5 (and more) kanji means that at least the first 2 kanji belong to the last name, making it much easier to decide "on the fly" whether the 3rd belongs to the last or first name.

Remains the case of 3 kanji, where only one kanji on each side belongs for
certain to last/first name. Knowing whether the middle kanji belongs to the
last or first name could prove difficult without some deeper analysis (and
since we are talking about rolling credits, the ability to be read easily
would be quite essential).

This approach seems a decent compromise between aesthetics and legibility. It
seems strange that it's been adopted as a standard in all Japanese movie
credits (I never realised it to be the rule, but definitely saw it often).
Maybe it has its root in some previous older media (e.g. lists of authors on a
book?).
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answer
I believe the rule you are looking for is called `人名字取り`. `5字取り` is the most
commonly used for the closing credits in movies. What this means, is
everything is aligned based on 5 characters.

Here is an image for reference
([link](http://www.ayatoweb.com/tv_design/tvd83.html)).

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

I found this [other reference](http://www.yut.co.jp/ht_jidori.htm) which has a
few more patterns (posted below). If I'm understanding the question correctly,
`5字取り` or `7字取り` pattern B seems similar to what sawa is explaining. However,
since there are many different patterns, it might be impossible to find an
exact match.

![enter image description here](https://i.stack.imgur.com/jvbO4.gif)
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answer