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1. Are these girls' or boys' names?

2. Are these girl's or boy's names?

Which of the above sentences is correct?
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Both sound correct to me. And I found evidence for both via google search.

Wynn: This name is variously translated as Welsh for “fair” or “white,” or Old English, meaning “friend.” It's often considered a girls' name, but it's another one with good crossover potential thanks to developer/entrepreneur Steve Wynn.

The names are separated into girl's names and boy's names.

I know that google search cannot prove anything, we still need some native speakers here to have a vote.
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Philip, I think I wouldl amend further: This is a girl's name. This is a boy's name. This could be a girl's or a boy's name.

But the plural "these... names" don't well in my brain with "a girl's" or "a boy's."
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Comments  
Teo1. Are these girls' or boys' names?

2. Are these a girl's or a boy's names?

Which of the above sentences is correct?
Number one is correct. For number two to be correct, you would need the provided addition. The first is still better, even with the correction.
 BarbaraPA's reply was promoted to an answer.
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And I cannot digest the following, taking from what I quoted earlier:

It's often considered a girls' name.

Why is it plural?