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 From Japanese 芳 (ha) meaning "fragrant, aroma, reputable, satisfactory" and 賀 (ka) meaning "congratulate, greet, celebrate". It's mostly in the northeastern Japan and may come from the place name in Tochigi Prefecture.
HainEnglish From the Middle English personal name Hein 1. This is derived from the Germanic personal name Hagano, originally a byname meaning "hawthorn"... [more]
HanawaJapanese Either from 花 (hana) meaning "flower" and 輪 (wa) meaning "loop, ring, wheel" or 塙 (hanawa) meaning "mountain, projecting tableland". The 花輪 spelling has multiple readings.
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".