This name combines 金 (kin, kon, gon, kana-, kane, -gane) meaning "gold," 欣 (kin, gon, kon, yoroko.bu, yoroko.bi) meaning "pleasure, rejoice," 欽 (kin, kon, tsutsushi.mu) meaning "respect, revere" or 錦 (kin, nishiki) meaning "brocade" with 也 (e, ya, ka, nari, mata) meaning "to be (archaic form)," 哉 (sai, kana, ya) meaning "alas, how, question mark, what" or 弥 (bi, mi, amaneshi, iya, iyoiyo, tooi, hisashi, hisa.shii, ya, wata.ru) meaning "all the more, increasingly."
Bearers of this name include singer and actor Kin'ya Kotani (コタニ キンヤ, born 小谷 欣矢) (1979-) and actor Kin'ya Kitaōji (北大路 欣也), born Masakatsu Asai (淺井 将勝) (1943-).
This name was most commonly used in most parts of the 20th century but nowadays, it's rarely given to boys, if given at all.