"Honchorigen" suggests another etymology in its description that 'the reason lefties are generally called "giccho" is in the Chinese character "左義長" (Sagicho (ritual bonfire of New Year's decorations)), which also means people who mainly use the left hand.'
『本朝俚諺』には、「俗間に、左の手の利きたる人をぎっちょといへるは、左義長といふ意、左専（もっぱ）らききたるに準（なら）ふ」とある。