I carried our daughter who is genetically related to my partner. She calls both of us mama and mom (often she uses the plural 'mamas' to address us both at the same time). To differentiate between us, my partner is mommy and I am mutti (german for mommy). We've had no problem coming up with names for ourselves, but we can't figure anything out for our known donor. We used a friend as a known donor, and we are still unable to come up with a name for him. Does anyone have any names for known-donors?