Surname
Kosaka
Kosaka (小坂) is a Japanese surname. Its kanji mean small + slope, and Wikidata lists 49 notable people with this family name.
こ · さ · か · こさか
What Kosaka means
小
small
坂
slope
Where the name comes from
Like most Japanese surnames, Kosaka describes a place. Its kanji point to a slope, the kind of landmark a family was known by when surnames became compulsory for everyone in 1875.