Formal:
* Mon père s'appelle... (This is the most common and formal way to say it.)
Informal:
* Mon père, c'est... (This is more casual and often used with friends and family.)
* Mon papa s'appelle... (This is a very informal way to say it, using the word "papa" which is like "dad" in English.)
Example sentences:
* Mon père s'appelle Jean. (My father is called Jean.)
* Mon père, c'est David. (My father is David.)
* Mon papa s'appelle Pierre. (My dad is called Pierre.)