Seraphymon takes his name from Seraphim, who is a figure in Judaic mythology. Seraph is also the term given to a type of angel, with plural seraphim. I don't know why they changed it to "y" in the dub, makes him sound like an elephant. (You know - pachyderm?)
Absolutely Useless but Interesting Fact
Coming soon - watch this space!
^ A picture of Seraphim ^