Hi Denis -- on Dec 31 2019 at 13:34, you wrote:

DM>    My name is Denis. And Your (name)?

DM>    (Is this valid question?)
               a valid

Yes, although we might also say (and would probably type it as): "My
name is Denis; and yours?

Depending on the level of formality, any number of variations are
permissible:

and yours?
and yours is?
and you are?
and your name is?



Cheers... Dallas

--- timEd/NT 1.30+