The word mathat appears 2 times in the Douay-Rheims Bible. The first 2 matching verses are shown below.
Luke 3:23And Jesus himself was beginning about the age of thirty years: being (as it was supposed) the son of Joseph, who was of Heli, who was of Mathat,
Luke 3:29Who was of Jesus, who was of Eliezer, who was of Jorim, who was of Mathat, who was of Levi,