Was talking with a friend about hypothetical children, and I asked him "Thought of any boy's names?", but then I wondered if it should actually be "boys' names". Any idea what I meant? Or could it be ambiguous? Does it matter if we're talking about one hypothetical boy being born and needing a name, or three? Or whether both a first and middle name need to be thought of, or just a first? Or is it naturally plural since you're drawing from a pool of names "appropriate" for all boys that were ever born? Is there a difference between the descriptivist and prescriptivist answer here?