637 (DCXXXVII) ebile ngwaga wa go thoma ka Sontaga, ngwaga wa boseswai ngwagengsome wa 630s, ngwaga wa bomasometharo šupa ngwagengkgolo wa Ngwagakgolo 7, le ngwaga wa bomakgolo tshela masometharo šupa ngwagengkete wa Ngwagakete 1.