eiki Share definition Flag A sparkling tree from Japanese descent. Boys named eiki will tend to have a female voice until after thr 4th grade. pronounced "ehhhh-key" or "achey". Eiki, stop eating so much mr.wasabi! you're the ill noodle-arms eiki by chovee September 4, 2008 0 0 Get merch Get the eiki mug. Buy Now — $32.95 See more merch