Caxtilcopa.

(a loanword from Spanish)

Headword: 
Caxtilcopa.
Principal English Translation: 

in Spanish, or more literally, in Castilian
(a loanword from Spanish, Nahuatlized)

Attestations from sources in English: 

From the Spanish word, Castilla, which is typically written in Nahuatl as caxtillan.