Well just going off of my last name now; which I am pretty sure will be the last name I have when I have kids as well, as I don't really plan to ever get married; anyway, based off of my last name, all B names are out, or most of them at least. Certain ones fit, but some like Bethany (don't like anyway) just would be too much. I also have a lot of of names that family/friends already have, that I'd feel weird using. I LOVE Seraphina, but I have a family member named Sarah, and that's just too close to me. I LOVE Camilla, but I have a Camille in my family, so that's out. I like Addison, but there is both a Madison and a Allison in my family already; also gets rid if Madeline. Another name I like is Guinevere, but there is a Gwen. I like Blair as a middle name, but that names is taken already. And the only boy name I can think of that is unusable due to family is Bradley, which i liked for a little while, because there are a couple names that are very close to this one. Oh and I LOVE Michael, as common as it is, but there are 3 Michaels in my extended family. So yeah, I think that's it. And the only family names I'm okay with using, are grandparents names or great-grandparents. I think anything else I would avoid.
I would never have used a name of an old flame or any of my husband exes. Also, any name that has made really negative headlines. Basically, you always want positive events/people associated with the name you choose for your child. And I like to honor relatives by using their names as middle or even first names, unless their names have been already used by other close family members. It is one of the funnest things in life to choose a name for your kid :)
My partner suggested Rose to me once, and I do like it, but I was close to someone who miscarried with the plan to give the baby this name. So it is off the table.