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There was already [this
answer](https://japanese.stackexchange.com/questions/2526/rules-or-criteria-
for-%E9%80%A3%E6%BF%81-voiced-or-unvoiced-syllables-in-compound-words)
regarding the basic rules of rendaku. However, it seems that these rules do
not apply at all to proper nouns, especially toponyms. Examples include
秋葉原｛あきはばら｝ (no rendaku) vs 千葉｛ちば｝ (rendaku), 川崎｛かわさき｝(no rendaku) vs 宮崎｛みやざき｝
(rendaku), and 石川｛いしかわ｝ (no rendaku) vs 神奈川｛かながわ｝ (rendaku), etc. I find no
patterns in those pairs. 秋葉原｛あきはばら｝ is especially confusing, since it
completely reverses the general rendaku rules, and I'd expect it to be
pronounced as あきばはら instead of あきはばら.

Therefore, is it the case that 連濁 in proper nouns (basically toponyms and
surnames) are pretty much random and doesn't really follow any pattern? Or are
there special rendaku rules for proper nouns?

By the way, it would be also welcome if anyone could explain why 秋葉原 in
particular has this eccentric voicing pattern.
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question
phonology phonetics rendaku
連濁 in proper nouns
Rendaku in proper nouns are basically random and unpredictable. Native
speakers read new proper nouns purely based on their previous experiences, and
ordinary people are not explicitly aware of any rules. Native speakers make
mistakes often when it comes to rendaku. I don't know why 千葉 is ちば but 石川 is
いしかわ. A correct reading can vary depending on what/who it refers to. See: [Is
it correct to read 黒川 as くろかわ or is くろがわ
correct?](https://japanese.stackexchange.com/q/42989/5010) I personally know
both あかはね-san and あかばね-san (赤羽), both たかた-san and たかだ-san (高田), and so on.
Sometimes local people may call a place with rendaku although its official
name is without rendaku, or vice versa.

* * *

The history of 秋葉原 is described on Wikipedia (emphasis mine):

>
> 明治に入り火除地になることで「あきはっぱら/あきばっぱら(秋葉ツ原)」「あきはのはら/あきばのはら(秋葉ノ原)」「あきはがはら/あきばがはら(秋葉ケ原/秋葉ガ原)」などと呼ばれ始め、
> **呼称は統一されていなかった** 。
>
>
> 当地区の呼称が「あきはばら」として定着するのは、鉄道駅の開設以降とするのが定説である。後に地名の読み自体も「あきはばら」となる。なお、1890年（明治23年）に開業した時点では「あきはのはらえき(Akihanohara
> Station)」であり、旅客は扱わない貨物専用駅であった。ちなみに、「あきはばら」の読みは秋葉原駅の駅名をつける際、
> **秋葉原の読み方を知らない鉄道官僚が勘違いして付けた** ことで生まれたとする説もある。
>
>
> いずれにせよ、「あきはばら」が本来だという説も「あきばはら」が本来だという説も、どちらかのみが正しいという論旨を支える歴史的資料は無く、両者とも正しくも有り間違いと言える。

So historically many readings existed (many other sources say あきばはら was
dominant in the early days). It was after the station named あきはばら opened that
most people started to use あきはばら. It is even rumored that this apparently
illogical station name was originally a mistake made by someone who did not
know this place. Anyway, the nickname of 秋葉原 is still アキバ, not アキハ.
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