I have a question. My sister's name is Megan, and recently I found an old birthday card from our great grandmother address to my sister, but the name Mashka was used (Машка). I'm not very familiar with Slavic names and language, so I asked some other family members about the name and nobody knew anything about it and just assumed it was made up because my great grandmother disliked the English language/names.
I couldn't really find any info about this name online, and it's not even listed on here. If anyone knows anything about it, that would be great. Even if it's just that it was probably a made up nickname.