Etymonline/good

O.E. god (with a long "o") "virtuous; desirable; valid; considerable," probably originally "having the right or desirable quality," from P.Gmc. *gothaz (cf. O.N. goðr, Du. goed, O.H.G. guot, Ger. gut, Goth. goþs), originally "fit, adequate, belonging together," from PIE base *ghedh- "to unite, be associated, suitable" (cf. O.C.S. godu "pleasing time," Rus. godnyi "fit, suitable," O.E. gædrian "to gather, to take up together"). As an expression of satisfaction, from early 15c.; of children, "well-behaved," by 1690s. [] 
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