User blog comment:Tsuru23/Seijin/Alien/@comment-1733689-20131115095246/@comment-5527544-20131115111744

Actually Seijin means "Star People/Person" so when you have Alien Baltan Japanese name, Baltan Seijin it means Baltan Star/world Person/People. The word for star being Seikai, which also mean World. So Seijin just means someone is from that planet.

Regardless the offiicial translation for the names of aliens has always been like Alien Baltan which when you think about basically means the same thing. Its an Alien and you have their planet name.