The British consonant cluster mb regularly became WCB. m(m), as can be seen in W. crwm, CB. kromm 'curved' < Br. *crumbo-. But in several instances, it occurs in the Cumbric evidence as mb. For example:
Crummack Dale and Crimple Beck are of limited use to this discussion, since they lie outside the Cumbric zone and could well have been borrowed before mb was assimilated in British. Examples with OE Cumbras are also dubious since we don't know when or where this word was borrowed - compare OE cumb 'valley', an early borrowing from Br. cumbo- which also retains mb. The same is true for OI Combrec, which was used to refer to any Brythonic language.
Jackson (1953) concludes that the assimilation of *mb > mm was complete in WCB by the 7th century but that it lingered in the north perhaps half a century longer. The evidence certainly suggests that mb was retained longer in Cumbric than further south, and the fact that the late names Cumwhitton and Cumwhinton contain no trace of b in early records suggests the sound did eventually become assimilated. If Jackson's summation and dating is correct, it does point to a deviation for Cumbric, but hardly a defining one.
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