Английский Этимологический словарь - caesarian

- 1923, shortening of Cжsarian section (1615); supposedly from Caius Julius Cжsar, who was said to have been delivered surgically, thus legend traces his cognomen to L. cжsus pp. of cadere "to cut." But if this is the etymology of the name, it was likely an ancestor who was so born (Caesar's mother lived to see his triumphs and such operations were always fatal to the woman in ancient times). And Pliny derives his cognomen from cжsaries "hair," since the future dictator was born with a full head of it. Cжsarian section may come directly from cжsus. Cжsar was used as a title of emperors down to Hadrian (138 C.E.), and is the root of Ger. Kaiser and Rus. tsar (see czar). He competes as progenitor of words for "king" with Charlemagne (L. Carolus), cf. Lithuanian karalius, Polish krol, Hungarian kiraly. In U.S. slang c.1900, a sheriff was Great Siezer.