Also Sojfer. From the Hebrew word meaning scribe of Torah scrolls, phylacteries, and mezuzoth. There are many variants of this name, such as Sojfer, Saufer, Sofer, Seifer, Sheifer, Zofer, etc.
Source: A Dictionary of Jewish Surnames from the Russian Empire, Revised edition, Avotaynu, 2008. Author: Alexander Beider. Page 853.