Across the world, อาณาจักร (อาณาจักร 
, Anajak 
, Arnajak ) is a rare predominantly boy's, but very seldom girly first name. The first name อาณาจักร is characteristic of South-eastern Asia, particularly Thailand, where it is a rare primarily boy's, but very infrequently feminine name. Very seldom, อาณาจักร is the last name as well as the forename.