When I read your post I thought... Why does she need to know WHO the person is? When I put myself in her shoes, I can seem myself being very curious about what client had referred you. I'm sure most people when someone mentions something like, "I heard from a friend that you are a good...." I have a friend who recommended you... " The first thing that would pop into my head is .... I wonder who that was. HOWEVER, if you told me.. that you were uncomfortable disclosing this information, I would not pressure you for it. I'm might still be curious, but I won't pressure you to disclose this information.

Now I think it is pretty common for T to get clients by way of other clients. I think they should know how to handle this professionally. I would think that treating two people who you know are connected in some way would certainly create biases. I can certainly see you concern here.

Have you talked at all to the person who referred you to this counselor? Based solely on what you said here, I think your friend should be at least made aware that this counselor has made the connection between you too.