A map of Hungarian megye http://lazarus.elte.hu/hun/maps/1910
The spelling came after your ancestor arrived to the "new land" knowingly or unwilingly. It comes down to pronounciation.
The LDS-Mormons (Family History Center) website is listing church records of Gelse, Zala megye and Koszeg, Vas megye. You can order the films and gather ancestral information.
There were 28 CSANADIs, 11 CSANADYs, and 5 GEROLYs that came thru EI.
Franciska on her EI manifest has that she is from Czak.
GEROLY (with umlauts on O) list in Koszeg's phone book.www.matav.hu/tudakozo/index_e.html