Shame, it's a nice idea. I only found one date for Aleksandra - 18 May. Pity there are loads for a couple of the others though... No way you could find their birthdays out from each other and still surprise them (a little) by knowing name days?
Thank you so much for listing them here! I think I could find a way to narrow my search down now to a couple of potential dates. Although it'll be hard- I know a Krzysztof who celebrates his name day on 25 July, even though his Birthday is in January and there are 2 other name days in-between....
Oh, and could you also please tell me when Jacub's name days are?
Think Michał is the correct spelling of one of the names I wanted to find out about. When is his name day please?