Where does “はな” come from?

はな (Old Japanese) comes from Proto-Ryukyuan *pana, from Proto-Japonic *pana — flower.

Ancestry of “はな”, step by step

StepLanguageWordMeaning
1Proto-Ryukyuan*panaflower
2Proto-Japonic*panaflower

Words derived from “はな”

Every word from Proto-Japonic *pana →Every word from Proto-Ryukyuan *pana →
はな — Etymology, Origin & Word History | Etymology Explorer