My Janus is Hungarian/slovak as it was not Slovakia at the time. Be sure to check your timeline to verify where they are from on the map at the time. These areas changed ALOT, certainly helped me. I have read that the Janus name came from two Direct lines, one was peasant folks the other was of royalty, Latin descent as far as the variation for Austria-Hungary/Czech/Hungarian-slovak goes. Janos and Jan are first name variations for the name John. Janusz, Janusewski are polish to my knowledge. My papas handwriting looks like Yanus and have located records under such.