Looking for last name Heitler.I have a maternal great-grandmother named Heitler; I've traced her grandfather and great-grandfather to Sikátor in Veszprém county, Hungary in the early 1800s. (They redrew the county lines and it's now in Győr-Moson-Sopron county.) They were Roman Catholic, but the village was majority Lutheran. (The Ottomans depopulated the village in the 1500s and it was re-settled in the early 1700s, mostly from various places in Germany, as far as I can tell.)
As you doubtless know, you can't do genealogy based on just surnames. Many people who are completely unrelated can have the same surname, while most of your closest relatives are likely to have a different surname.