This is the 515th most frequent Polish word.
mam
"Mom" means "I have" in English.
In this sentence, 'mam' is the first-person singular present tense form of the verb 'mieć', which means 'to have'. It indicates possession.
Mam książkę.
I have a book.
Here, 'mam' is used in a negative sentence to express not having something, as 'nie' negates the verb.
Nie mam czasu.
I don't have time.
In this phrase, 'mam' is part of an expression meaning 'I am named' or 'My name is', where the verb 'mam' refers to holding or possessing a name.