Clarke Families from Youghal (Cork/Waterford?)

Hi

I have spent many unsuccessful years trying to identify the ancestry of William Aldworth Clarke, born ca 1792.  Indications are that he was from Cork City but this is not confirmed.  DNA has now confirmed that William was descended from an old Quaker  family from Grange, Antrim.  I have traced one branch of this family to Youghal with several references to them also in Cork City, so I suspect this may be the family I am looking for.  Is anyone tracing Clarkes from the area around Youghal in particular?    The patriarch of the Youghal line was a Gabriel Clarke who died in 1737 in Youghal.   The Quaker records on FindMyPast have been helpful but I am still searching for a missing link between William Aldworth Clarke and Gabriel Clarke.

Regards Chris