Copper in Polish is "miedź". If it was borrowed from a foreign language they would use Latin not English (there's almost no English loandwords in Polish at the

Copper in Polish is "miedź". If it was borrowed from a foreign language they would use Latin not English (there's almost no English loandwords in Polish at the time) so it would be cuprum. Or they could use German - so Kupfer. In any case the second vowel would be "u". So "Kopernik" name is probably related to the dill plant (koper).