All the names have fairly simple etymology in Slavic tongues, but make only arbitrary sense in Germanic ones.
In Gottes Namen, you're without a doubt some kind of Slavic revisionist! I've considered it all and it sounds of pure Germanic origin to me! Um Gottes Willen!
Seriously though, this should be obvious even to a German who does not speak Polish. But hey, who needs reality, when you know "Die reinste Wahrheit"?