I looked this one up on HL, and one of the pics (the second one) from Mr. Axmear makes it look like it may be rhizomatous. That, or he planted one heckofa drift of them ;-!
I also looked at the db for info such as that but didn't see any mention of that.
Having watched actual Osprey many times (I like watching them fish even better that Bald Eagles), I am perplexed with how and/or why this Hosta was so named.
Perhaps the esteemed Mr. Pollock will someday write about it in my fave part of the AHS Journal, in his 'What's in a Name' series (hint, request).