Question

How would most French speakers ask their neighbor's ten-year-old son his first name?

Answer 1

Bonjour !!

how would I ask my neighbor's ten-years-old his first name ?

if he is only 10 years old, I'm not going to use the formal form of "you" => "vous"

I'll use the unformal form of "you" which is "tu" (2nd pers. sing.)

A- Quel est ton prénom ? (what is your first name ?)

OR

B- Quel est ton nom ? (what's your name ?)

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EXPLANATIONS

A- Comment vous-appelez-vous ?

(FALSE  because you won't use "vous de politesse = formal you)

B-  Quel est ton nom de famille ? (what is your family name ? FALSE because the question says "ask his first name....)

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hope this helps ☺☺☺