Cognomen Theonas (Theonas 
) , in the entire world, is a rare last name. The last name Theonas is characteristic of Greece, where it is quite a rare surname, Tanzania, where it is a rare surname, and Romania. Not in comparison with a country's population, this name is the most popular in Tanzania, Greece, and Ethiopia. Also, Theonas is the forename as well as the last name.