I know how difficult it is when first starting research but there are so many great resources on the Internet -- this site for one.
Both sides of my family -- parents, their parents, their parents were born in Semlak.My father's side, the Reformed Church, were in Balmazjúváros (a way station) a generation or more.My mother's side, the Evangelische Lutheran Church, were in Mezoberény for a while before coming to Semlak.
My father's surname was Keller before it was magyarized to Pinczés, his mother's name before magyarization was Rosinger and then was changed to Rózsa.
My mother's maiden name was Wagner and her Wagner grandparents were Martin Wagner and Elizabeth Grünwald.Her mother's parents were Andreas Bartolf and Magdolna Maas.
My parents, grandparents, aunts, uncles, etc., etc. also first lived in Harrisburg and, for the most part, all the relatives went first to Cameron Street or Herr Street.My grandmother had a rooming house for a while (not sure of time period) but don't know if it was on Cameron -- my guts say yes.They then moved to Rochester where a large group of people from Semlak lived.The names of those in Rochester from Semlak, to name just a few, were Keller, Wagner, Beck, Christ, Hirsch, Grunwald, Safnauer, Krehling, Gotschik (in the manifests it's spelled Gocsik), Brandt, Mayer, Holczimmer, etc., etc.They were a close knit group and socialized with one another.
I have the Semlak Reformed Church Familienbuch (listing of births, deaths, marriages) but didn't fink Yanko or Janko so that must mean your gr grandfather might be Lutheran.
A wonderful, wonderful site to visit is the web page for the Semlak HOG (Heimatortsgemeinschaft) at www.semlak.de
There are pictures, a history (in English) of Semlak, the HOG documents and the 20th Heimatbrief (newsletter).If you click on the Heimatbrief button, it'll take you to a listing of the contents of the heimatbriefs but if you go to the very last one, you can get into volume 20.Great pictures in the newsletter.If you can read German, then you have no problem.But if you can't, you can translate it at the http://babelfish.altavista.com/trhttp://babelfish.altavista.com/tr site which translates rather strangely at times but it gives you the basic message and there's lots to learn in volume 20 (funeral practices, for example).
Hope I can be of help -- just keep in touch.If you want to communicate with me directly, write to me.