There are Winkler families throughout all German speaking regions. Most of them NOT related.
My Winklers were/are from Carinthia:
Gertrud Winkler married to Josephus Fischer at Steindorf/Ossiacher See
daughter of Franciscus Winkler and Ursula Schweinzerin (no older date available as Parish records of Tiffen before 1735 are lost.
Michael H. Weber