Yes. You need to fill in a form, with ID's with both persons and all that jazz. You can find it on bnet.
I can't find the form. Can you link or something?
I can across it ones when trying to unban an account of mine. Iirc the way to merge your accounts is to first change the name of the account into yours, using 2 ID's. This is done with the form. Then when they have the same name you can merge them with a ticket, I think. I came across the form on the support section of battle.net
If i got to the point where i had the ID of the account i wanted merged, what would be the best way to persuade a blizzard into merging the accounts?