noun, noun which may take the genitive case particle 'no', na-adjective
Mexican
Refers to things or people from Mexico. Used as a noun or adjectivally with の or な.
今夜はメキシカンのレストランに行かない？
How about going to a Mexican restaurant tonight?
彼はメキシカンだから、スペイン語が話せる。
He's Mexican, so he can speak Spanish.
メキシコ is the country name 'Mexico', while メキシカン is the adjective/noun for 'Mexican'.
Borrowed from English 'Mexican'.