Elegab gets his recognition for sure but I still don't think he gets enough, one of my favorites for sure.
So, when the original Japanese name of the figure gets translated, there's this phrase that just comes across as "Double Nga". ジュラ => Jura ダブル => Double ンガ => Nga Google and its Translate could only get me so far, but I think it just means 'double headed', no? Nothing Elegab specific. It's just Two Headed Jura.
I realize this was asked over a year ago, but I think the name is a reference to the older Elegab character, Daburunga (also a two-headed character, so the 'Daburu' = double). 'Jura' may be a reference to Jurassic period, perhaps implying that this is a prehistoric version of Daburunga.