Hi everyone, sorry if this is in the wrong place but i'm not quite sure where to put this

I'm trying to trace the origins of a family name. Stowell Marshall. The name keeps popping up in every generation along with Gilbert Marshall and i'm trying to track it down. the earliest record i can find is Stowell Gilbert Marshall born 1776 dies 22/5 1837 and was married to a Mary Gilbert in county of High Ham in 1796 she dies 14th sept 1854. i'm prety limited with information being all the way over in Australia so if anyone can help or point me in the right direction it would be grealy appreciated.
Thanks
Melissa