Hi I am a UK based Pexton. It is a very rare name in the UK with small clusters of Pextons in Sheffield, Leeds and Glasgow as far as I know. I think the name is a corruption of the slightly more common Paxton. I believe there is a Scottish clan Paxton (with its own tartan) see
http://www.scotweb.co.uk/tartan/Paxton-/59870So I think the name Pexton is really an alternative spelling of Paxton and hence is a Scottish name. My own parents were both born in Glasgow. Obviously my mum had a different surname prior to marriage!
Sorry I don't know anything much more than that.