LawrenceKinden:
Questionable in what way? Though Tonks certainly seemed to agree that her name was ridiculous, the naming practices of a culture removed from our own can be interesting. The name "Nymphadora" is in reference to the nymphs of Greek mythology, spirits of nature. In a culture that interacts with centaurs and elves, among other things, I see no reason why a name based on words that reference nature spirits should be questionable (other than it sounds funny to modern ears).
I suspect that the author chose the name because such spirits are often associated with mischief. In "A Midsummer Night's Dream", Puck/Robin Goodfellow is an elfin creature who is known to take many shapes. The same play makes reference to the elfin practice of stealing young humans and leaving behind in his or her place a "changeling".
Well, by "questionable" I meant that it could cause problems for its owner due to being teased and even taunted as a child based on it--it's more than "sounding funny," it's a name that recent teenagers, even in the wizarding world I'm figuring, would be likely to associate with nymphomania (nearly uncontrollable sexual urges in a female) as much as with the nymphs of Greek mythology.
The name may have a legitimate basis in legend, history or literature, but it's still important how a child's contemporaries are going to respond to it--and therefore to its bearer--that's something that parents should consider in naming their newborn babies before getting too clever or cutesy.
In the HARRY POTTER books, many of the adult characters have unusual, obscure or seemingly antiquated names (by Muggle standards anyway)--Albus, Alastor, Minerva, Severus, Remus, Sirius, etc.--but most of the children don't--IIRC the exceptions being Draco, Luna and Ginevra (Ginny Weasley's full first name).
Of course, having a name like Bottom, from "A Midsummer Night's Dream," wouldn't that result in its bearer developing into a spankophile? --C.K.