We are planning on using MIL's first name as baby's middle name. MIL is an amazing woman who has been through a lot and has treated me better than my own mother. We are waiting to share the name until the baby is born. I'm positive that my mother is going to have a very difficult time with this and be jealous that we're using MIL's name and not hers. Sadly, my mom and I are not close. She is pretty mentally unstable, thinks that the world revolves around her and that everyone else owes her something. I can only imagine what her response will be based on previous baby-related discussions I've had with her. Luckily, she lives over 800 miles away, so I'll only have to deal with her on the phone for the most part.
If you're using a family name and have shared it with others, have you had any negative responses? If you're waiting, do you anticipate any difficulty from family members who might feel slighted?