User blog comment:Spellbinder666/grendizer/@comment-26403415-20150515233418/@comment-1809047-20150516002330

There's an entire list on the Saucer Beast page. And the -l or -ru parts will be named either way depending if one doesn't sound as awkward as the other. Girugiru for example is fine, but Gerugeru just sounds weird so I went with Gelgel; they're both good just picking whatever sounds better until official material says otherwise (not likely given 40 year history).