"What is your son's name?" should be accepted
Accepted as of 12 September 2018, thanks for reporting!
not accepting :(
Yes, much less awkward
No English speaker would ever say 'What is the name if your son?'
What's your son's name?
Also, "What is your son called?"
I love this course because I can use natural English in the translations, but this one let me down. Please let's keep this as a good course - it's been excellent so far!
Good one is :
"What do you call your son ?"