a Norman surname, but etymology from Brix (place in La Manche, Normandy) is now considered doubtful ["Dictionary of English Surnames"]. Its earliest appearance in Britain is in the person of Robert de Bruis, a baron listed in the Domesday Book. His son, a friend of David I, king of Scotland, was granted by him in 1124 the lordship of Annandale, and David's son, Robert, founded the Scottish House of Bruce. As a given name for U.S. males, most popular for boys born c. 1946-1954.
word-forming element expressing state or condition, in medical terminology denoting "a state of disease," from Latin -osis and directly from Greek -osis, formed from the aorist of verbs ending in -o. It corresponds to Latin -atio.
<a href="https://www.etymonline.com/word/brucellosis">Etymology of brucellosis by etymonline</a>
Harper, D. (n.d.). Etymology of brucellosis. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/brucellosis