Jezb
Glad the information was a help. Don't know why Richard changed his name to Williams - it seems to have been superficial, i.e. by word of mouth rather than by deed poll so it could have been for a reason of convenience. Lownds is not a usual name but Williams is so maybe he didn't want to stand out. One can only guess without documentary evidence.
I have occasionally come across a baptism with 'alias' by the surname. Whether this means they had changed their name like Richard I don't know but, while not common it was by no means unheard of.
Looked for Sarah Rammell. My records on one church only go back to 1775 on St Leonard's Church (work in progress) and assuming she wasn't born before that date then she wasn't baptised in Deal. Plenty of other Ramells from two main families, parents Nathaniel & Susanna and Ingram & Elizabeth. Both names in the first couple appear as children of John & Sarah. Also Redman, Susanna's (1807) middle name, was the name of one of Nathaniel's children.
Interestingly, the only Sarah Ramell to appear was one who had an illegitmate child John Mitchell Ramell on 24/4/1803 baptised at St George's. She wasn't baptised in Deal, either.
Regards
AJ