Cambrian (adj.)youdaoicibaDictYouDict
1650s, "from or of Wales or the Welsh," from Cambria, variant of Cumbria, Latinized derivation of Cymry, the name of the Welsh for themselves, from Old Celtic Combroges "compatriots." Geological sense (of rocks first studied in Wales and Cumberland) is from 1836.
chateaubriand (n.)youdaoicibaDictYouDict
"grilled beef steak, garnished with herbs," 1877, named, for some reason, for French writer François René, Vicomte de Chateaubriand (1768-1848).
Precambrian (adj.)youdaoicibaDictYouDict
also Pre-Cambrian, 1861, from pre- + Cambrian.
UmbrianyoudaoicibaDictYouDict
c. 1600, noun and adjective, in reference to Umbria, ancient region of central Italy, or its people or the Italic language they spoke.