Scorpio

wiktionary

ref

From Latin scorpiō(“scorpion”). Doublet of scorpion.

etymonline

ref

Scorpio (n.)

zodiacal constellation, late 14c., from Latin scorpio (poetic scorpius) "scorpion," also the zodiac constellation (see scorpion). The meaning "person born under or ruled by the sign of Scorpio" is recorded from 1968. Since 1922 the official (International Astronomical Union) scientific designation of the constellation has been Scorpius, leaving Scorpio to astrology.