Here is a list of open cultures
PLEASE NOTE THAT THERE ARE INDIGENOUS TRIBES IN THESE COUNTRIES LIKE THE NENETS, ABORIGINALS AND SÁMI PEOPLE. DO YOUR RESEARCH ON NAMES.
Russian
German
Polish
Italian
British
French
Swiss
Dutch
Greek
Ukrainian
Austrian
Norwegian
Swedish
Croatian
Irish
Icelandic
Finnish
Czech
Slavic
Scottish
Hungarian
Bulgarian
Latvian
Estonian
Slovenian
Lithuanian
Belarusian
Welsh
Basque
American (please note a lot of made up movies names take inspiration from other cultures ie; Aziraphale is made up but it is still a Hebrew name so its closed)