Comment by shadowofneptune

I wonder how far back this practice goes. There are quite a few Polish-American last names which are like that, to the point that the original last name has been forgotten.

EDIT: Aha! this website has a guide on these names, and even dispells the Ellis Island explanation I was told as a kid: https://pgsctne.org/changed-surname-list/

They did it the same way you did.