Tiarchnach Prev Random Next GenderMaleOriginCeltic/GaelicRegalGreekGoddess, godly; Tia is also an abbreviation of names like Althea and Dorothea. The mythological Thea was Greek goddess of light and mother of the sun, moon and dawn.Syllables2Alternate Spellings of TiarchnachTianna, Prev Random Next Share this:TweetRedditShare on Tumblr