Looks like youre right The article states that the accent is known to be as far reaching as Flintshire in Wales Runcorn in Cheshire and Skelmersdale in Lancashire and this sentence has lots of sources But then theres this Scouse  is an accent and dialect of English found primarily in the Metropolitan county of Merseyside and closely associated with the city of Liverpool So most probably this name comes from the fact that Scouse is spoken primarily in the county of Merseyside Its an unsourced statement but would you agree Personally I dont know Id rather study phonologies of accents than their exact reach