This is the 43rd most frequent Polish word.
m
The Polish word "m" is an abbreviation for "meter" (a unit of length) or an abbreviation for "mieszkanie" (apartment).
Here, 'm' is part of the word 'mam,' which means 'I have.' It is the first-person present tense of the verb 'mieć' (to have).
Mam na imię Anna.
My name is Anna.
In this context, 'm' is part of the verb 'jestem,' meaning 'I am.' It indicates the first-person singular of 'to be.'
Jestem zmęczony po pracy.
I am tired after work.
Here again, 'jestem' is used to denote the first-person singular of the verb 'to be,' with 'czy' introducing the yes/no question structure.