Is the plural of "BlackBerry", BlackBerries or BlackBerrys?
I am asking, because I'm altering the underlying brand name to look more like the food and less like the product, leaving the reader to infer it from context.
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However, I found the "proper" answer in a BlackBerry Branding Guidelines PDF from 2007 (page 5):
Avoid using the RIM Marks generically, as nouns or verbs and do not use them in the plural or possessive form.
- Do not use the RIM Marks in plural or possessive form.
✓ BlackBerry® smartphones
BlackBerrys, BlackBerries, BlackBerry’s
This is in agreement with what some other answers have suggested.
I would write Blackberries rather than Blackberrys. The latter looks like a terrible spelling mistake. For most situations, altering the brand name in this way won't matter.
However, if you're preparing a formal document and need to use the exact trademarked name, then you'll have to use a circumlocution such as Blackberry devices or Blackberry phones.
I often turn to the New York Times for answers to questions like these. Search for "BlackBerrys" and "BlackBerries" here and see what you find.
Well, ok, I'll just tell you: they exclusively use "BlackBerrys." And if it's good enough for the New York Times, it's good enough for me.
The technically correct plural of Blackberry would be Blackberrys because it's a proper name. Using an apostrophe, i.e. Blackberry's, is improper because it is neither a possession nor an acronym. You could get away with treating it like the fruit, i.e. blackberries, and nobody except a stickler for proper grammar would complain.
I didn't vote for @senderle's post because the New York Times isn't good for anything except lining a birdcage. ;-)