an unusual way to speak of a person of Culhuacan/Colhuacan, which was more typically called a culhua or colhua; the plural from colhuacatl would be colhuaca, but colhuaque was more prevalent for the plural
grandfather, ancestor(s), forebear(s) (see Karttunen, Lockhart, and attestations; see also colli, meaning a bent or twisted thing; perhaps grandparents were thought of as bent over or they carried a cane with a bent handle? (see glyphs for the name Cocol in the Visual Lexicon of Aztec Hieroglyphs).
something bent, twisted ("col" seems to be a root for many terms with this meaning, although colli usually translates as grandfather, grandparents, forebears, or ancestors)