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  1. Is there a source for not verbally (or in writing, for that matter) mentioning the name of Yeshu (the father of Christianity)?
  2. If there is such a source, what exactly is forbidden to say? Is it only the English and/or the "full" pronunciation in hebrew (i.e. with an "a" after Yeshu - please verify the validity behind this as well) and not the hebrew (as i have heard that yeshu is just an acronym for yemach shemo vezichro), or is it even the name Yeshu itself? Please include sources, preferably with links
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yeshua is a name found in tanach (nechemia 8:7 for example) so there can be nothing inherently wrong with saying it as a nickname for yehoshua -- context would be key. the problem might be with the English designation as "anointed one" because that posits a fact with which Judaism disagrees so we shouldn't be condoning it by using that name. – Danno Dec 17 '12 at 18:48

According to the sources cited by the Gra on Shulchan Aruch, Yoreh De'ah 147:3, the prohibition against mentioning the name of a foreign deity does not apply to the name of Jesus, and in fact we find that he is mentioned by name in many sources.

In a very interesting teshuva, R' Esriel Hildesheimer discusses this issue at some length. He comments that the prohibition against mentioning a foreign god's name applies only to speech, not to writing and that the prohibition does not apply to speech for the purpose of Torah study or psak halacha.

Nevertheless, R' Hildesheimer writes that the traditional practice has been to avoid explicitly mentioning the name of Jesus (referring to him instead as oso ha'ish - "that person"), and it is proper to uphold that practice.

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The big issur should be regarding writing Jesus with the C word because it implies endorsement. – Bruce James Feb 7 '13 at 23:16
Among Yiddish (and Yeshivish) speakers, he is often called Yoshke, i.e. "little Yeshu". – Adám May 21 '14 at 21:16

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