Nov 1, 2015my answer always included the qualification that "genii" is limited to a particular meaning of "genius". If you use the word to mean "an intelligent person" then the plural can only be "geniuses". Genius is the correct spelling that comes directly from latin:
Word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from old french -ous, .
'/><text x='50%' y='52%' font-family='Arial,Helvetica,sans-serif' font-size='44' fill='white' text-anchor='middle' dominant-baseline='middle'>Funy</text></svg>)
