Word Origin & History
TexasMexican province, briefly an independent nation and now a U.S. state, from Sp. Texas, Tejas, earlier pronounced "ta-shas," originally an ethnic name, from Caddo (eastern Texas Indian tribe) taysha "friends, allies," written by the Spanish as a plural. Tex as a nickname for a Texan is recorded from 1909.
Tex-Mex "of Mexican-Texan origin" is recorded from 1949, from Texan + Mexican. An earlier noun for "Texan of Mexican background" was Texican (1863). Baseball Texas-leaguer is recorded from 1905.