I think, you have Swiss-Roots?
The places of origin, of the Loertscher and Zmutt families, are both in the same area, close to the City of Thun, canton of Bern. Zmutt is a very rare family name. I found only 7 entries in the Swiss directories.
Places of origin:
Zmutt: Zwieselberg, Canton of Bern and Zermatt, Canton Valais.
Loertscher: Spiez, Wimmis, Diemtigen, Oberwil im Simmental, all situated in the Canton of Bern and Hubersdorf, Canton of Solothurn.
Do you know more about the Zmutt family in the US?
Greatings from Switzerland