No relation to this surname, but happened to hear on CBC Radio Halifax July 17th when somone phoned in the name to Terry Punch, certified genealogist, for comments. Terry knew it was German in origin. he caller (?) mentioned an ancestor who was granted land in Jemseg, NB (used to be spelled Jam Sag).
I notice in phone listings there are 5 TRIFTS in all of Canada (NB-2, PE-1, ON-1, AB-1) and only one in all of USA (in Seattle, WA).