Board Thread:General Discussion/@comment-27033632-20151013213706/@comment-4504370-20151013225250

Tails has two tails, and his actual name is a (incredibly un)clever pun on "miles per hour," a unit of velocity in those areas that (still) use the imperial system of measurement (because there are people actually named Miles, but you can't say the same for Kilometers or Kayems, or what have you).