Thera is a female name.
Thera is a diminutive of the name Theresia. The name probably originates from the Greek island Santorin, which was once called Thera or Thira, or from the neighbouring island Therassia or Thirassia.
Thera means “from the island Therassia”, “inhabitant of Thera”, but as well “huntress” (from ancient Greek “theraein” = to hunt or “thēríon/θηρίον” = huntable/wild animal) or “harvester” (from ancient Greek “therizo” = to harvest). Another meaning of Theresia is “summer” (from Greek “theros/θέρος”).