a Spanish surname; a famous figure with this name was the licenciado Francisco Ceynos, a judge and senior member of the Audiencia in New Spain who had the virtual power of a viceroy after the viceroy, Luis de Velasco (who was much more of a friend to indigenous people) had died
Camila Townsend, Annals of Native America: How the Nahuas of Colonial Mexico Kept Their History Alive (Oxford: Oxford University Press, 2016).
a large shrimp (see Molina); a small shrimp; a freshwater shrimp; a red or white shrimp; a crayfish; sometimes also translated as crab; sometimes a nickname for a boy (to get these many translations, Google "chacalin")
a person's name, e.g. don Constantino Chacalin, a ruler from Michoacan who was married to doña Agustina de Guzmán, who would become an important figure in Coyoacan; the word chacalin means "large shrimp" (central Mexico, 1614) see Annals of His Time: Don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, James Lockhart, Susan Schroeder, and Doris Namala, eds. and transl. (Stanford: Stanford University Press, 2006), 282–283.