What is the meaning of Mac?

ISO 639-2/B language code for Macedonian.

Clipping of mackintosh (a raincoat).

A person of Scottish descent, used in driving culture to denigrate someone for poor/slow/amateurish driving responses, a reference to the frugality of Scottish people.

Clipping of macaroni.

small stone, pebble

Clipping of maquereau (pimp).

Clipping of Macintosh.

son

A common prefix of many Irish and Scottish names, signifying "son of".

mother

sin

Alternative form of make (equal, partner)

son

bond, surety

Alternative spelling of macc (son, child)

mother (human female who begets a child)

fire

light firearm

prison

son

poppy

quack (sound made by ducks)

son

Used as a prefix for Irish and Scottish patronymic surnames; -son

Source: wiktionary.org