Most of the time, even on this site our Lord's name is spelled Yeshua, but in Hebrew the first vowel is a tsere, pronounced "ay," so that his name is Yayshua.  We have seen many and varied ways of writing his name: Y'shua, Yahshua, Yahushua, etc.  Yayshua happens to be a shortened form of Yehoshua.
     Yayshua is the most accurate possible English rendition of the usual Hebrew spelling for His name.  Unless we dig up some MSS with the other spellings, this one remains and is the only way to pronounce His name that exists in the Hebrew tradition.