Among the Scottish and Irish it is derived as a translation for several Gaelic names that come from Riahach,Brindled, Gray, it is occasionally found as a place name for the English or Scotsman who originated in Graye in Cavados, from Latin Gratus,welcome. Grey, legrey are variations.
Numerous cognates exist as well.
James had a brother George Gray and a sister Ellen Gray. Mellie died in a rest home in Ironton. I have not verified this, however I was told an Indian girl ran away from home and gave herself the name Casebolt so as not to be found out. Also being told, if you are a Casebolt and you meet another of the same name you are related. All US Casebolts are kin.