How many fruit-related names are available, anyways? There would surely be a different lawsuit coming their way if they named it AppleDB. (ok, I admit this is a terrible joke)
If "Mango" can get away with it, I think it is very cool to provide a graceful path to open source tech.
I don't have much pity for the $33B company that promotes its mediocre semi-proprietary database to unsuspecting devs/students who don't know better.