Ok I'll chime in here too. Heres what I heard from somebody that used to work there (and also I think in one of the many other "what does MBNA stand for" threads.

It USED to stand for Maryland Bank North America (I'm pretty sure it was North America, but positive about Maryland Bank).

Anyways, they had issues, went bankrupt or something, and got bought out I believe. Since then it has been MBNA, standing for nothing specific really, just MBNA.

Gagan