Pascha mistranslation…
nHow did such a large mistranslation come about?
n
n“The King James Version Bible was written by scholars whose orientation was toward Catholic and Anglican church doctrines, and this caused some of the errors in translation i.e., the translation of the Greek word pascha, which means ‘passover’, as "Easter" in Acts 12:4.” 
                                           - Biblestudy.org
(http://www.biblestudy.org/question/what-does-the-word-easter-mean.html)