"Variant of Nasir"
The name Nassir is commonly a male name from the "Arabic" origin.
Nassir is an English spelling of the Arabic name Nasir, which is built on the Arabic root n-s-r, a root with the sense of helping, supporting or granting victory. Nasir, Nasser and Naser are other transliterations of the same name in English use, and Nassir follows the pattern of doubling a consonant in transliteration without any change of meaning.
Nasir means "Victorious".
The pronunciation of Nassir is nah-SEER.