I'm here. Tz'unun, also spelled dzunun, tzunuum, tz’uunu’n, etc. in different branches of the Mayan language family, is one of the onomatopoeic names that hummingbirds go by; there's at least one other hummingbird researcher out there in cyberspace who uses a form of this word as a screen name. I've been collecting indigenous words for "hummingbird" as I run across them, so thanks to Sarah and Bruce for adding to my collection. Here are a few of the one I've gathered so far, presented with utmost respect to the First Nations, who have a longer cultural relationship with hummingbirds and deeper understanding of their true nature than most of us do. I welcome additions and corrections to this list.
Haida = Sah Sen
Cherokee (Tsalagi) = wa le la, wa le li, wa-le-lu
Taino (Arawak) = colibri
Tlingit = teh-KEK-ti-AAH
Nahuatl = huitzil, huitzilin, huitzitzilin
Navajo = dah-he-tih-hi
Hopi = tootsa
Comanche = temumuquit
Pima-O'odham = wipismal, vipismal
Potawatomi = nanokas (NAH-no-KAHS)
Blackfoot = naamóísisttsii