köken: Originally a compound of 御 (o-, honorific prefix) + 早く (hayaku, “early”, adverb), from adjective 早い (hayai, “early”). Modern Japanese -i adjectives formerly ended in -ki for the attributive form. This medial /k/ dropped out during the Muromachi period, both for the attributive form (-ki becoming -i) and for the adverbial form (-ku becoming -u). However, the adverbial form reverted back to -ku…
köken: Blend of ciao + hello, popularised by a greeting used by Inaba Meguru (因幡 めぐる) in the game Sabbat of the Witch by YUZUSOFT, released 27th February 2015 (21st July 2023 as for the Chinese version).
köken: Inherited from Old Ruthenian до́брый день (dóbryj denʹ), from Old East Slavic добрꙑи дьнь (dobryi dĭnĭ), from Proto-Slavic *dòbrъ dь̏nь. By surface analysis, univerbation of до́брий (dóbryj, “good”) + день (denʹ, “day”). Compare Polish dobrydzień, Belarusian дабры́дзень (dabrýdzjenʹ).
hi (greeting) · hey (to get someone's attention) · bye (often repeated twice: hei hei)
köken: From Proto-Finnic *hei (compare Estonian hei, Ingrian hei, Karelian hei, Ludian hei, Veps hei). Compare also Old Norse hei (whence Swedish hej) and English hey.