 In his "Life", it is commonly spelt as "Cathroe", but other forms are given such as "Cadroe" (heading) and "Kaddroe" (3x), which come closer to those used later at Metz ("Cadroe", "Kadroe").His biographer explains it as meaning "a soldier in the Lord's camp(s)" ("bellator in castris Dominis").Some scholars have proposed that what the continental monks heard and transcribed was a Brythonic, more specifically Old Cumbric name, the first element of which represents Cumbric "Cat" "battle".