From Britain or the land of the Britons
Brittian is a rare variant of the name Britain or Britton, originally used as an ethnonym for someone from the British Isles. It derives from the Latin 'Britannia', referring to the Celtic tribes known as the Britons who inhabited the region before the Roman and Anglo-Saxon periods. As a given name, it is often chosen for its geographic and ancestral connections.
Less common today
Brittian isn't in the latest US Top 1000. It last peaked at #7,479 in 1995.
American football player
US births per 5-year period, 1990βpresent (SSA data).