Formal:
* आपका नाम क्या है? (Aapka naam kya hai?) - This is the most polite and formal way to ask someone's name. It literally translates to "What is your name?"
* आपको क्या नाम है? (Aapko kya naam hai?) - This is another polite and formal way to ask someone's name, and it literally translates to "What is your name?"
Informal:
* तुम्हारा नाम क्या है? (Tumhara naam kya hai?) - This is a more informal way to ask someone's name, and it literally translates to "What is your name?"
* तेरा नाम क्या है? (Tera naam kya hai?) - This is a very informal way to ask someone's name, and it literally translates to "What is your name?" It's typically used among friends and family.
Note: The choice of which form to use depends on the context and your relationship with the person you are speaking to.