There may be a something of a precedent. Webster's 2d gives -
- A sweet Spanish wine like muscatel in flavor.
But it’s more likely the name comes from soft nostalgia for tough North American male talk of the 1950s, where bastard designates one’s adversary, a spoiler, a wildcard, someone who plays by other rules.
Ah took Sam huntin’, he was only an itty-bitty runt just big enought
to hold up the gun hardly ... but he was a mean shot from the
beginning. And Ah’ll tell ya, he just didn’t like to have anyone
interfere with him. That was one thing could always rile him, even
when he was an itty-bitty bastard. / Norman Mailer Naked and the Dead
Editorially I can’t push the magazine [the Beacon] to the left because Harris is a
shrewd, opportunist bastard who won’t permit it. However, if we load
the magazine with Bolshevik writers of national reputation, we can
have Harris hanging on a ledge before long. / Saul Bellow to James T.
Farrell in an undated 1937 letter
He’s such a comical little bastard ... / James Jones, From Here to
Eternity
Traditionally its positive uses are to designate objects "of an unusual shape or proportion; of abnormal shape" (W2) such as a bastard musket, or the viola bastarda. Also plants that might be called psuedo-, such pseudo-daphne for oleander in Greek, are called bastards, a bastard fig being “one of several juicy fruits of the genus Opuntia.”
There’s also recent blackletter typeface called Bastard (1990) available “in three weights: Spindly Bastard, Fat Bastard, and Even Fatter Bastard.” Traditional Bastarda is one of four forms of blackletter typefaces, which go back to Gutenberg.
In a bastarda, [the lowercase o] is pointed at top and bottom and
bellied on both sides. / Robert Bringhurst, The Elements of Typographic Style.
William Gaddis, who uses the word seventeen times in The Recognitions, slants it once this way:
Wyatt had modified his handwriting to a perverse version of
Carolingian minuscule...The looked like M, and p a declined
bastard of h.