金刚 generally means “King Kong” but what does it mean in 金刚小石 and 金刚小玉. Is it some sort of a title or something because 小石 and 小玉 are names, right?

昨天中午2时许,金刚小石、金刚小玉在母亲带领下,来到本报,一见记者面,兄妹俩便作了番自我介绍:我们是“龙凤胎”茶艺师,是“峨眉派茶艺的惟一传人”,能表演23道精彩叫绝的茶艺表演。

Thanks!