I have been a regular visitor to mid-Wales since 1985 (up again next week, for the end of May Bank Hols). The problem, is that people there just talk about 'Mac' and 'Aber', so opportunities to confront the full spelling of their respective names are few. Even after all these years, I can (just) spell 'Aberystwyth' without recourse to a map, Google, etc. but, err 'Mac' still gets me in a pickle. Not helped by the fact that early-on (for some reason) I got it into my head that it was actually 'Macyllinth', as in 'Maccy Linth' (I sometimes still think that to myself even now), its a bit like an 'ear worm', but with spelling rather than a song/tune (LOL).