Name: Susan Virginia (Zone 8a) God is the only thing that matters.
Yes, wait till fall and let them bloom so, it will help with the id. Wow 15 years! Are they huge? I have a great article about dividing Hostas and its for pots or ground Hostas. Read the last three paragraphs and it will encourage you.
Consider the lilies of the field, how they grow; they toil not, neither do they spin: And yet I say unto you, That even Solomon in all his glory was not arrayed like one of these. Mat.6:28-29