SIL and I were pregnant with our five year olds at the same time. We discussed names and both had a particular girls name we loved. I was due first and she asked me to let her have the name because she said she had fertility issues so it was likely to be the only child she'd ever have. I let her have it.
Now I'm pregnant again and I still adore the name. SIL has gone on to have two further children and we only see them around five times a year at most. I'm tempted to ask if she minds if I use the same name for this baby if they are a girl. They'd have different surnames and wouldn't ever attend the same school or anything. It isn't a really common name but it also isn't unheard of (think Lucy.) It was my grandma's name and this will be my last DC so I either use it now or never.