"Variant of Dorothea"
The name Dorthea is commonly a female name from the "Greek" origin.
Dorthea is a variant spelling of Dorothea, the Greek name formed from doron, meaning gift, and theos, meaning god. The Dorthea spelling is recorded in Danish and Norwegian naming and begins appearing in United States birth records in 1882, consistent with northern European immigration in that period.
Dorothea means "Goddess, also short version of Dorothea".
The pronunciation of Dorthea is dor-THEE-uh.