My opinion on her name would be my guess closest to "All that remains." If you think about it, Spyro did escape, yes, BUT Cynder was the last one known to exist because she was captured and all the other eggs crushed. If in the eyes of the dark master of course he would most likely name her after the remainder of her generation because even he couldnt foretell Spyro actually surviving or anything. Which this could also correspond to When the dark master would become free if something hadnt been messed up, The name Cynder like the term smoldering cinders and ash, *just like some names you could spell them different and sound the same* was to resemble he as the one to bring the doom. Ummmmm to better and more understanding, The dark master was going to turn everything to smoldering ash and cinder so how fitting would it be to have a queen after the state of the world he would make? The evil guy gets a laugh and he dies from old age....

I mean The mastercheif...Hmph doesn't sound much Bible like to me or Gordon Freeman

Anyway, I think her name comes from the this little saying:

so and so will turn everything into Ash and Cinder... basically referencing any evil entity or mass that scorches the landscape with intense flames that the resulting area is no more than a flaming barren wasteland.

So her name can mean:

Then end of all suitable life

A by product of something evil or some intense fire

A foreboding reference that will plague said land.

Or her soul or heart is that of Cinder or that she'll turn you into Cinders.

Yeah.