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I came across the phrase "誰か行きたい人" in this
[thread](https://japanese.stackexchange.com/questions/23860/can-%E3%81%9F%E3%81%84-and-%E3%81%9F%E3%81%8C%E3%82%8B-be-
used-for-a-1st-2nd-3rd-persons-desire?noredirect=1&lq=1) and I think it would
be used in a context like "誰か行きたい人がいるか？".

However I am kind of confused by how it works grammatically. Is 誰か行きたい a
relative clause modifying 人, while it is at the same time implied that this 誰か
and 人 are the same entity?

Is it similar in this way to a sentence like 太郎はメアリがリンゴをむいたそのリンゴを食べた。?
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grammar parsing relative-clauses
Is 誰か行きたい人 a form of double-headed relative clause?
I'd say it's not a double-headed relative clause, because it's actually

> 誰か[[[行きたい]人]いる]？

That is to say, 誰か is modifying the full predicate of 「行きたい人いる？」.

You can scramble to 「行きたい人誰かいる？」, which supports that 誰か is not in the
relative clause.

* * *

However, even with this analysis, it is a somewhat confusing grammatical
structure, since 行きたい人 and 誰か could both be seen to be semantically pointing
to the same entity. This raises the question, are they both grammatical
subjects?

I think it _might_ be possible to see this as a "double-subject construction"
(which is a poor name IMO, despite being used in the linguistic literature),
where you can analyze the sentence as having a [clausal
predicate](https://japanese.stackexchange.com/a/9796/3097):

> ? 行きたい人は[誰かがいる]？

Note that it's odd to really use particles in a question sentence (it's more
natural to use the [zero
particle](https://japanese.stackexchange.com/questions/54643/%e3%81%8c-vs-%e3%82%92-and-
the-absence-of-a-subject-particle/54661#54661)), but I think it is borderline
possible here as a linguistic exercise, and supports the double-subject
construction analysis...

The following declarative sentence seems to work slightly better:

> 行きたい人は誰かがいるはず。

But even then it’s awkward.

The original word order is even less open to particle insertion IMO, though:

> ?? 誰かが行きたい人いる？  
>  ? 誰かが行きたい人はいるはず。

Due to the unnaturality of the above sentences, I think **it's best to
understand 誰か as an 'adverb' or 'modifier' in these sentences** as opposed to
a grammatical subject, even though it can serve as a grammatical subject in
other cases (like 「誰かがいる。」 or 「誰かいる？」).

Supporting evidence for the adverb analysis can be found by drawing a parallel
何か, like 「何か質問ありますか？」 or 「何か質問あったら(…)」, where 何か is even more opposed to being
marked by が.
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I think that here 誰か doesn’t mean who but somebody. Moreover , it has an
adjectival function.

If you regard 誰か as an adjective i.e. translate it as “any” instead of
“anybody”, then the structure becomes obvious.

“ Is there (いるか) any (誰か) person who wants to go (行きたい人)？ “
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