Otlazpan (Mdz28r)

Another example of otlatl as part of a place name, perhaps the same one as this, can be found on the Códice de Otlazpan, a neighbor of Tepejí del Río. It appears at the top of folio 11, and it has six stalks of bamboo. Another difference is that the plant's roots show in that example (published on line by Arqueología Mexicana). Frances Karttunen suggests that the "otla-" might be followed by -īxpan, which combines ix- (face, eye) with -pan, the locative suffix ("on" or "at"), to create the larger locative suffix -ixpan, "before" or "in front of," which leads to the reading she suggests as an alternative to "On the Bamboo." But, she adds, dropping the long vowel is problematical. So, I wonder if the verb "otlaza" ("to block the road") might be the root, even if the bamboo is there to provide a phonetic indicator?