'we can find a Peter Jonathan KEAR born in Cardiff 1717'

There is a website

Glamorgan Look-up Exchange

http://freepages.genealogy.rootsweb.ancestry.com/~walesle/gla/chrec.htm

They may be able to give you more information.

Looking at the Gloucestershire Genealogical Database - early KEAR's could be spelt KEARE/KEIRE/KEYRE/KERE/KEIR etc

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There is on Ancestry a List of Emigrants from England to America - 1718 to 1759 - no KEAR's or variations of the surname listed.

Many other lists of Emigrants various places and dates on Ancestry