(Classical Japanese or literary) the classical copula “to be”, equivalent to modern Japanese である (de aru) or だ (da), or adjective particle な (na)

a surname

(poetic) this evening, tonight / (in the morning, from the perspective of “this night (that has just ended)”) last night

a dolphin erected as a daybeacon or daymark: a navigational marker indicating the bounds of a water channel / allusion to 尽くし (tsukushi, “exhausting”)