Well depends on which kind of greek you want. if you want a current modern name Thea would not be a greek name. If you want a mythological name then yes it would be a greek name. all in all i would not recommend this name for your child.
Thea (or thia) means aunt.
Theo means "God" or "Gift from God"
"Goddess".
Eisai thea, in Greek, means "you are a goddess" in English.
The female name Thea is of Greek origin and its meaning is 'goddess.' It is a variant of the Greek name Theia.
It is greek
The name Thea is not directly mentioned in the Bible. It has Greek origins and is derived from the Greek word theos, meaning "God" or "goddess."
The name Tia is a name with Greek origins. It means like a goddess, after the Greek goddess of light, Thea.
The name Tiah is a Greek baby name. In Greek the meaning of the name Tiah is: Goddess; godly. Also abbreviation of names like Althea and Dorothea. The mythological Thea was Greek goddess of light and mother of the sun; moon and dawn.
Thea Gottschalk's birth name is Thea Hauer.
Thea Samuelson's birth name is Thea Connors.
Thea Holme's birth name is Thea Johnston.
Thea Gill's birth name is Thea Louise Gill.
Thea Ringen's birth name is Thea Jondal Ringen.
Thea Aichbichler's birth name is Thea Aichbichler Mohr.