Olga, a Russian name of Norse origin in Greece

[Faklon]

Olga hailing from Norse Helga (holy) is a common name in Greece. I can't think of any other name that it is so popular and at the same time so foreign in Greece, pretty much every other common name is of Greek, Biblical and (old) Latin origin (Constantine, Markos...).

The only reason and source I can find is that it became popular under the rule of Olga Constantinovna,

Olga Constantinovna of Russia

Olga Constantinovna of Russia (Greek: Όλγα; 3 September [O.S. 22 August] 1851 – 18 June 1926) was Queen consort of the Hellenes as the wife of King George I. She was briefly the regent of Greece in 1920.

[Rgvgjhvv]

The only Olga I know personally is Greek-Cypriot

[Hulu]

It used to be popular in south Albania too, now you can't find it under 70 years old.

[Moje ime]

It's also Serbian name but not very common today.

[Ujku]

Also Natassa is popular (Same in Albania ) .

[Faklon]

Also Natassa is popular (Same in Albania ) .

Natassa is Greek, Anastasia

[Faklon]

The only Olga I know personally is Greek-Cypriot

Many Cretans have it too, like Olga Kefalogianni

[Art23]

Ukrainian too, but it should be spelled as Olha.

[Ülev]

^^ Olcha
Olsza, olcha

https://pl.wikipedia.org/wiki/Olsza