Talk:Puck/@comment-107.131.97.125-20160511203810/@comment-72.174.143.48-20160627084726

The name is canonically Pack on the official Japanese Re:Zero anime website.

The anime subs you see aren't canon. I presume they're translating it as Puck because of Berserk. (" パック" is canonically "Puck" in Berserk, but Berserk is not Re:Zero)