For the source text click/tap here: Gittin 11
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In discussing the reliability of witnesses who had signed a contract, we find Reish Lakish asking Rabbi Yohanan how to deal with a case of witnesses who sign using non-Jewish names. Rabbi Yohanan responded by relating a case where a contract came signed by two people named Lukus and Los, and it was accepted. The Gemara continues that giṭṭin coming from the Diaspora are accepted with signatures that appear to be non-Jewish names, since we know that many Jews in the Diaspora have such names.
We explore the use by Jews of foreign names in history from talmudic times through the Inquisition.