Trying to find a Polish name for family tree (Whydisquof = Władysław)

Hi, im in the process of creating my family tree and i have polish family.

Im stuck with my great grandfathers name, His english name is John and im told its his polish name translated. im unsure how to spell his name so im just going to try and write it,

If anyone is able to correct it i would be very grateful

The name ive been told sounds like Whydisquof ?

Thanks in advance

John = Jan
Whydisquof = Władysław