Is there an apostrophe in the expression "was a kids name"?

In this sentence would there be an apostrophe in "kids name" or no apostrophe to indicate generalization?

For ex: Peter's grandmother used to think that "Penny" was a kids name and "Lolo" was a shy girls name. So she decided to name her grandchildren with names other than these.

Should this be "kid's name" and "shy girl's name" or "kids' name" and "shy girls' name"?