Pews in Scotland

Hi,
My great grandmother Sarah Pews was born in Dunbartonshire, Scotland in 1893 to James Pews and Jane McGranathan. James Pews and Jane McGranathan got married in 1888 in Dunbartonshire, Scotland. I also know that before James Pews was married to Elizabeth Blakely, before she died and they had childrens together. I know that the parents of James Pews were James Pews and Jane (or Agnes) Kirkwood.
And I've been doing research and it seems that James Pew family is not from Scotland and that is parents didn't married in Scotland.

I'm looking for descendant of James Pews, or somebody who knows where his family came from.
Thanks.

Nicolas Ednie