Genealogy /
Just found out I'm Polish! [45]
Coshomre,
First, it's most likely your ancestor was actually (first) named 'Casimir'.
Since they came to Texas, the most likely Port would have been Galveston and it might be possible to look at those records and get lucky.
Another thing, the Polish communities in South Texas are in the same general vicinity so if you know where they lived it might be possible to check the Parish records and see if anything comes up.
Being that they changed the surname it's going to be very difficult but not impossible.
Also, the South Texas Poles came from most of the same Parishes in Southern Silesia so if you get lucky and figure out the proper surname it should be fairly easy to track further back.
Don't know if I helped much- but I wish you luck in your genealogical pursuits.
J