Question

What is his/her/your(formal) name? in spanish

Answer 1

Como te llamas ? is the equivalent of the" tu" in French. It's for friends ,young people, from your age not for persons you never met . It's not formal
(accent on the first o de como)

the formal form is

Como se llama Usted  ? ///or plural   Como se llaman Ustedes ?

sorry for the inverted ? and the accent on the first o de como I don't have the right PC keyboard...!

Hope I helped !!