a surname / a place name, such as that of Koga City in Fukuoka Prefecture

(mathematics) negativity, being negative (less than zero) / (physics) negativity, being negative (of electrical charge of an electron) / negativity, being negative (bad, pessimistic)

(sciences) activation; stimulation

達也, 達矢, 竜也, 辰弥, 達哉, 辰哉: a male given name