The name [name]Crosby[/name] probably has significance to your friend’s parents, possibly her mother’s maiden name, or her grandmother’s, or other family name that didn’t filter down to her generation. In some places, surnames that even sound masculine were given to girls - that doesn’t make [name]Crosby[/name] a “girls name.” Now, it is becoming more common practice in general to use surnames for girls, but I still don’t see [name]Crosby[/name] as a girl’s name unless it has significance to the parents. It is otherwise out of the blue, not really that attractive a choice. It would have to be really significant.
I think there is a dog named [name]Crosby[/name] somewhere on tv, so mostly it reminds me of that, and not even [name]Bing[/name] [name]Crosby[/name] so much. Maybe your friend [name]Crosby[/name] has a sisters named [name]Hope[/name] and Lamour, and her parents just like the “Road to…” movies of the 1940s on, featuring [name]Bob[/name] [name]Hope[/name], [name]Bing[/name] [name]Crosby[/name], and [name]Dorothy[/name] Lamour, or maybe they liked “White [name]Christmas[/name].” It’s a very unusual name choice, and I think in the current scheme of surname names for boys and girls, this one’s for boys whether you have a reason or not, or for girls only if you have a good reason.