I was wondering if anyone knows if siwek is a shorter version of a longer name, my children inherited that name from their father, but unfortunately their was no close relationship with my husband and his father who was Daniel Thomas Siwek. He left him at the age of 5 with 2 brother 4 and 3. He lived in a part of michigan were he had children also, we don't know how many exact, but are interested in meeting them.