A Polish person would claim this name to be Polish. But actually in my native language which is Lithuanian, Vanda was a goddess of water - vanduo. Not many people know this. English dictionaries usually point out that this name could be of Slavic origin. It is not true as Lithuanian is a Baltic language.
In Georgian, the name is written as: ვანდა
Sources:
• https://kids.ge/baby-name?id=1796 (in Georgian)
• https://web.archive.org/web/20130130192114/http://name.interes.ge/dreams.php?action=view&id=380&from=action=search%7Cby=ვ (in Georgian)
• see the entry for Vanda: http://geogen.ge/ge/wsearch/4309/ (in Georgian)
• (general): https://www.linkedin.com/pub/dir/?first=Vanda&last=&search=Zoeken
• https://ge.linkedin.com/pub/dir/Vanda/+/ge-0-Georgi%C3%AB (lists only bearers living in Georgia)
• https://www.facebook.com/search/people?q=vanda
• Vanda Shiukashvili (1905-2001): https://ka.wikipedia.org/wiki/ვანდა_შიუკაშვილი (in Georgian)