(Russian) name of Scandinavian origin, originally derived from the Old Norse adjective heilagr ‘prosperous, successful’. It was imported by the Scandinavian settlers who founded the first Russian state in the 9th century. St Olga of Kiev (d. 969) was a Varangian noblewoman who was baptized at Byzantium in about 957 and set about converting her people. The name was introduced to the English-speaking world in the late 19th century, but retains a distinctively Russian flavour.
Italian, Catalan, and Portuguese: from fava ‘broad bean’, applied as a metonymic occupational name for a grower or seller of broad beans, a nickname for a bean eater, or a topographic name for someone living in an area characterized by the cultivation of this plant.