Formal:
* Beth yw eich enw? (pronounced: beth oo ehch enoo) - This is the most formal and polite way to ask. It literally translates to "What is your name?".
Informal:
* Beth yw dy enw? (pronounced: beth oo dee enoo) - This is a slightly more informal way to ask, suitable for friends or people you know well. It literally translates to "What is your name?".
* Sut mae dy enw? (pronounced: soot may dee enoo) - This is a more casual way to ask, meaning "What is your name?".
* Pwy wyt ti? (pronounced: pwee ooit tee) - This is a very informal way to ask, meaning "Who are you?".
Using "chi" or "ti"
"Chi" is the formal pronoun for "you", while "ti" is the informal pronoun. You should use "chi" when talking to someone you don't know well or are in a formal setting, and "ti" when talking to someone you know well or in an informal setting.
Example:
If you want to ask a friend their name, you could say "Beth yw dy enw?". If you want to ask a stranger their name, you would say "Beth yw eich enw?".
Remember that the best way to ask someone their name depends on the context of the situation.