Middle names beginning with b for a girl

We are expecting a baby girl, our second, in January. My husband is Jewish and it’s a family/cultural naming practice to honor a deceased relative when naming a baby, either with the name of that relative or with the first letter of their name. With our first, we didn’t do it, because he’s secular and I’m not Jewish and...we just wanted to name our baby what we wanted!! But my MIL was CRUSHED. And as soon as she found out we were pregnant again she started turning the screws about honoring her mother. I was resistant at first...I never met her mother, and though my husband has enormous respect for his grandmother, she wasn’t a favorite or anything. But over time I’ve come around to it and accepted the idea. His mom has been really good to us and so important in our daughter’s life, and this is super meaningful to her. SO. Our compromise is that we will use the first letter of her name in baby girl 2’s middle name. Her name was belle. Which I don’t like for personal, rather than aesthetic, reasons. We are having such a hard time with b middle names! Please help!!!! First names are narrowed to 3: Imogene, Opal, and Harriet. I know some folks will think those are all awful, but that’s ok. Not interested in new first name ideas...just PLEASE give me some middle names with b!!!