Hi Josh, Joe and all,
N. dominii was the first man made Nepenthes hybrid. It was (or is)N. rafflesiana x N. gracilis. All those old Victorian hybrids were given pseudoscientific names before there were standards for horticultural registration. Some of them were even scientically described-a full latin description written!
Josh, you could take your baddest looking plant from the grex-the one that stands out above all the others- and register it as N. 'Dominator'. That is an english word firmly rooted in its latin origins without being latin, and retain the meaning you intended.