halacha - Mentioning Yeshu's name?

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