I don't know whether you've read LOTR (you told me you haven't read HP), but I just thought I'd mention that Strider was the Ranger name by which Aragorn / King Elessar was known among the hobbits, at least before his true identity was revealed. If I had to guess I'd attribute use of Strider as a name to LOTR.
Along the same vein, the young X-man (well, X-girl) Rogue's real name is Marie; my assumption would be that that was the inspiration for that baby's name.
At least both sources are heroic.