Like Nonna and Adar stand for Wendy and Richard the adopted children stand for some of their planned pubublications.
Sorry that I cannot quote probably or link to my source - beat forgetable me* - but that's what I remember:
Tenchi - Blood of Ten Chiefs
Geru - The Elfquest Gatherum (one of them)
Nima - stands for Anima, a never developed storyline around Jink
They were busy indeed, weren't they?
*or help my poor memory in case you know
Easter EggQuest 2012 found