[dhosek]

Except that assumes that Dracula is first declension, and it might as much be third declension which would make it Dracules.

[hoseja]

Dracula isn't even Latin. It's Slavic declension. His father was Dracul (Dragon), from Emperor Sigismund's Order of the Dragon and he's son of Dracul - syn Dracula.

[dhosek]

The Slavic languages, of course, have their own declension patterns, although a common masculine suffix is -y or -i which brings us back to the original Draculi (!).