Two Syllables
cleo, clio, deo, geo, keo, keogh, keough, kyo, leo, meo, neo, reo, rio, seo, seow, theo, yeo, ayo, deyo, deyoe, keio, maio, mayeaux, mayo, meyo, seo, teo
Three Syllables
castillo, mckeough, pestillo, tokio, toshio, trujillo, yoshio, yukio, zedillo, aguayo, cacao, demayo, hideo, judeo, lacayo, mateo, matteo, moncayo, mondeo, pelayo, shigeo, takeo