GigaJapanese It might mean 儀間 "ceremonial space" spelled as 儀 (gi) meaning "ceremony, rite, righteous, etiquette" with 間 (ga) meaning "pause, between, interval". It is found mostly in the Ryūkyū Islands.
HagaJapanese Ha means "Fragrance,Aroma" and Ga means "Congratulations". It's mostly in the northeastern Japan, and most likely comes from the place name in Tochigi Prefecture.
HanedaJapanese From Japanese 羽 (hane) meaning "feather, plume" and 田 (ta) meaning "field, rice paddy". It can also be formed from 羽 (ha) meaning "feather, plume" combined with 根 (ne) meaning "root" and 田 (ta) meaning "field, rice paddy".