Dax \dax\ as a boy's name is pronounced daks. It is of French origin. Place name; a town in southwestern France that dates from before the days of the Roman occupation. Familiar today as the name of a character on the TV show "Star Trek: Deep Space Nine".
Dax has 2 variant forms: Dack and Daxton.
Baby names that sound like Dax are Dex and Dix.
Dax is not a popular first name for men but a somewhat popular surname or last name for both men and women (#64726 out of 88799). (1990 U.S. Census)