Cam in Gaelic can in this instant be used as wounded. In Campbell it is an honorific originally given to Cahlin Mohr MacDunneh (Colin the big or great son of Dunneh) It was Cahlin that took a sword stroke in the mouth and survived in the 1100s. Since that time all the descendants of Cahlin (founder of clan Campbell) have used this keltic description of a battle injury as the family surname.