That’s a pretty way to spell it. 
Hmm, lets see:
Generation (Many, a few of each key)
Clarke (2 original and 3 Sweetones)
Feadog (just one, D mark3 I think)
Doolin (1 two-piece D)
Walton (one normal D, a LBW and a Guinness)
Oak (2, C and D)
Shaw (D)
Susato (wb A)
Syn (Full set of Aluminium whistles)
Chieftain (Low D)
Dixon (low D combo)
That makes 11, I wonder if I left some poor whistle out.
I have 4 right now, with a 5th on the way:
1 Freeman tweaked sweetone
1 Feadog
1 Bamboo whistle (Erik the Flutemaker)
1 Burke High D
with 1 Dixon Low D on the way. 
I play actually not so much different whistles/flutes :
1 Susato soprano D one piece whistle
1 clarke soprano D whistle (tweaked by myself)
1 special whistle (tweaked body of a generation with a (i guess) waltons head ,sounds brilliant now (soprano d or C )
1 self constructed crystal whistle Soprano D ( not perfect yet but on the way to that)
will write in another time about the self worked whistles.
need professional whistles now,but thats another thread.
Julian
Alba, Burke, Chieftain, Clarke, Copeland, Dixon, Generation, Hoover, Overton (Colin+Bernard), Walton, Susato, Indian-Bamboo-Cheapos, Indonesian-Bamboo-Cheapos, Indian-metal-cheapo.
I think that’s about it, so, not counting the cheapos it’s:
11 brands (or 12 if you count the 2 overton-makers as separate)
Erm.
Generation x 3, Feadog x 2, Clare, Clarke x 2, Susato, Dixon, Burke. Mainly cheapies, then, but the Burke’s a beaut. Tully on the way next year too, and I am on the verge of a Sweetheart. Whistle that is, not a girl
Please Sir, can I have some more?
Here is the inventory today:
Alba - 1
Clare - 2
Clarke - 3
Dixon - 1
Feadan - 1
Feadog - 1
Generation -13
Hoover - 1
Humphrey - 2
Jubilee - 1
Susato - 1
Waltons - 3
This does not include a few selfmade. All of the above whistles are good. They represent a lot of different keys and sounds. One whistle does not fulfill all moods. I choose a whistle by how I feel today. The most often played are the Alba, Humphreys, Hoover, Feadog and Gen C in Nickel.
Ron
Clarke (7) + 1 tweaked
Generation (6)
Susato (1)
Shaw (3)
Alba (1)
Dixon (2)
Cooperman (1)
Feadog (2)
Clare (1)
Unbranded (1)
Schylling (1)
Anyone else got one of these last? I bought it for $4.99 in the US last year, and frankly it would have been a rip-off if it had been 10% of that. It looks quite nice - black mouthpiece and “nickel” tube, but it is totally unplayable.
O’Riordan, Water Weasel, Susato, and my Generation are all I ever play (in roughly that order). I’ve also got an old-style Burke, a Silkstone, and a misc. cheapie or two gathering dust.
IMO Susatos are cheap, durable, and they play well, if a little plastic-y. They’re the perfect whistle to take places you wouldn’t take a good whistle. And they are a great source of cheap, reliable whistles in odd keys. (I’m sure one day my B-natural Susato is going to come in handy…)
Generation,Waltons,Shaw,Jubilee,Susato,Clarke,Feadog,Clare,Doolin,Sindt,Oak.Hohner,Viceroy,Dixon,Alba,Chieftain,Howard,Overton(Bernard),Overton(Goldie),Copeland,Busman,Humphrey.
TWENTY TWO (if you count the Overtons as sub-species!).
looks like you’re the record holder! 
It would be nice if Dale joined in her and told us how many brands he has. I’ve got a feeling he can hardly count them all.
Currently , I have 8 different makers. Clarkes , Jerry-tweaked Shaws ,
Walton Mello Ds , Burkes , Greenwood/Boisvert , Humphreys , Copelands , and Overtons . Geez , looking at some of the other’s lists , my case of WhOA isn’t all that bad !! May have to start looking for some more whistles. 
Have a Great Day and Fun Whistling !!
Clare, Feadog, Dixon, Sweetone, Meg, Clarke traditional (2), Generation (3), Chieftain, Walton’s, Shaw, Hoover CPVC (2), Hoover Whitecap, Homemade (2).
Freeman Tweaked Gen - 3
Freeman Mellowdog
Oak-2
Humphries
Clare-2
Sweetone
Susato-2
Sindt on the way
8 Brands
At one point at least, I suspect that JessieK would have beaten Dale. I seem to remember a picture of all of Jessie’s instruments…it looked like she had 5 of every kind. 
Only 4 (only 3 are ever played): Clare, Cillian O’Briain, Oak, Feadogh or however you spell it…it’s trash no matter what.
Eric
I also hold RECORDERS(Thirteen of 'em)!
Abell, Burke, Copeland, Sindt, O’Riordan, Schulttz (Water and Thin Weasels), Busman, Dixon, Hoover, Serpent, Humphrey, Syn, Susato, Kerry, Silkstone, O’Briain, Alba, Elfsong, Clarke (originals and Sweetones), Shaw, Soodlum, Walton, Generation, Perri, Faedog, Clare, Eagle, Harper, Sweet, Tully, Parkhurst…
Used to have Cook, Overton, Grinter, Howard, Seery…
Need to get back an Overton - preferably some killer tuneable low E, because I’ve never had that key of any whistle and because no bona fide whistle collection lacks an Overton.
Philo
Forgot Doolin, Oak
I only have a Walton’s right now, but when I gain more experience I’d like to try out some different brands. The tough part about buying whistles is that you can’t try them out in a store until you find a good one, it’s more pot luck I suppose.
Does anyone have a favorite whistle dealer/shop?