A surname and forename for males, derived from the Hebrew word "mattityah" which means "gift of God".
People named Mathis are usually friendly, talented and helpful guys which keep their word but might also be a little lazy sometimes.
While the name is often used as surname it's (especially in Europe) a not uncommon forename as well.
Other variations of the name are Matthis
Also the "City of Mathis" is a small town in Texas.