Formal:
* Olá, meu nome é Olivia. (This is the most common and polite way to introduce yourself.)
Informal:
* Oi, meu nome é Olivia. (This is a more casual way to say hello, suitable for friends and family.)
* E aí, meu nome é Olivia. (This is even more informal and used with close friends.)
You can also use:
* Prazer em conhecê-la(o). (Nice to meet you.)
* Eu sou a Olivia. (I am Olivia.)
Remember that the correct way to use "a" or "o" before "Olivia" depends on whether you are male or female.
Hope this helps! 😄