This is the 997th most frequent Italian word.
chiama
"Chiama" means "calls" in English.
In this question, 'chiama' is part of the reflexive verb 'chiamarsi', meaning 'to be named' in the sense of bearing a name.
Come si chiama quel ristorante?
What is the name of that restaurant?
Here, 'si chiama' is used to describe someone's name, indicating identity or designation.
Lei si chiama Maria.
Her name is Maria.
In this case, 'chiama' is the verb 'chiamare' conjugated in the third person singular, referring to the act of making a phone call or summoning.