Well, from my limited knowledge of the Spanish language the letter "o" ending a word is "masculine" so I guess the names of male wrestlers ending in "o" makes sense.It's a bit odd but probably won't last long. Santino has to lose that US title eventually.
Ya know what I just realized? Every Hispanic wrestler's name ends with the O sound except Sin Cara (Mistico). Mysterio, Alberto Del Rio, Hunico, Camacho, Epico, Primo. Is that common in Spanish or something?