wɔfrɛ me

Frɛ means "call". With the prefix wɔ- (they) and an object pronoun, it gives a person's name: Wɔfrɛ me Kofi (I am called Kofi, literally "they call me Kofi"). Here "they" means nobody in particular, the way English says "they say". Twi often uses this impersonal wɔ- where English uses a passive.

Order. Frɛ is followed first by the person, then by the name: Wɔfrɛ me Kofi, Wɔfrɛ no Abena (She is called Abena). Change the object pronoun to talk about someone else.

Asking. Put sɛn (how) where the name would go: Yɛfrɛ wo sɛn? or Wɔfrɛ wo sɛn? (What is your name?). The yɛ- (we) version is impersonal too, like "what do people call you?". The same question works for things: Yɛfrɛ eyi sɛn wɔ Twi mu? (What is this called in Twi?)

Wɔ or wo? Keep ɔ and o apart. Wɔfrɛ me means "they call me", but Wofrɛ me means "you call me". See the subject prefixes.

Spelling. You may also see frɛ written ferɛ, closer to how many people say it: Yɛferɛ wo sɛn? Frɛ is the standard spelling. Me din de is the other common way to give a name.