Sneaquill is a combination of "Sneasel" and "Quill" as in feathers. Whereas Theivile/Theivsler is a combination of "Thief" and "Weavile/Sneasler," respectively. This entire line is Based on... you guessed it... Velociraptor...

The two different forms of Sneaquill are meant to represent Johtonian Sneasel and Hisuian Sneasel. By doing this, I am able to have them represent the two radically different depictions of Velociraptor that media has to offer.