Could be, but "Stoltzfus" is like "Smith" or "Jones" in the Amish country. For example, I bought my shed from Stoltzfus Woodworking in Leola (which is near Lancaster). There's also a Stoltzfus restaurant nearby, a Stoltzfus insurance agency, etc. etc...
Nah, it's about 10 times Smith or Jones.
I go through Lancaster County a dozen times a year; look at the mailboxes; some absurd % are "Stoltzfus."