Meaning of Kaszubowski
Kaszubowski surname may be connected with the Kashubian region located in the northern Poland - Kaszuby.
en.wikipedia.org/wiki/Kashubia
You may also check this thread related to people who live in this area:
https://polishforums.com/genealogy/descent-something-called-kashoop-kaszub-59035/Grazyna Grezlak
Probably misspeled - Grzelak is the common name in Poland.
Gregosz
It should be Grzegorz (most likely another typo of yours)