The constellation’s brightest star, second-magnitude Alpha Pavonis, is called Peacock, a name given in or around 1937 by the UK’s Nautical Almanac Office for use in The Air Almanac, a navigation guide produced for the Royal Air Force. The RAF specified that all navigation stars should have proper names, so this name was coined for the otherwise unnamed Alpha Pavonis.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/astronomy/catalogs/bayer/alpha-pavonis/alpha-pavonis.md
Alpha Pavonis (Wikipedia) Alpha Pavonis (α Pavonis, abbreviated Alpha Pav, α Pav), formally named Peacock /ˈpiːkɒk/, is a binary star in the southern constellation of Pavo, near the border with the constellation Telescopium.