Is the Easter Bunny pagan? Probably not. It seems to have been invented by German-speaking Protestants sometime in the 1600s.
Bibliography:
Stephen Winick, “Ostara and the Hare: Not Ancient, but Not As Modern As Some Skeptics Think,” Library of Congress Blogs, April 28, 2016.
Stephen Winick, On the Bunny Trail: In Search of the Easter Bunny, Library of Congress Blogs, March 22, 2016
The creator’s statements appear to be rooted in the source, “On the Bunny Trail: In Search of the Easter Bunny.”
You may be interested in the discussion under the article between commenter J.H. and the author Stephen Winick, where Winick explains his reasoning on the matter.