Tôi tên là An.

Note

Could also be: Chị / Anh /Em / Cô /Bà / Ông / Mình etc.,. Pick the appropriate pronoun depending on your age and the relationship that you have with the other speaker. More details here: https://www.reddit.com/r/VietNam/comments/xmiyi7/in_vietnam_what_are_the_rules_for_what_pronouns/