I'm Alan Gagg & I come from a large extended Gagg family which we thought came from  the South London area of England. Early research showed that   members of our family were living in Westminster, Londons in the late 1700's. Since the late 1700's our family  have lived in the city of London & spread out through London - Kent - Wales - Ireland - Canada & various other parts of England.
The earliest Gagg we have found so far in London was born in 1540 approx.
Other members of the 'Gagg Family' are in Yorkshire - the Midlands - The West Country - Australia & The USA, Germany, Canada, Brazil, Switzerland & were in Barbados and France . We are all working to find the common link so please help with any info you can.
Alan M Gagg.

Since I wrote this at the beginning of 1999 a lot more info on the various families has been found out and it seems that the London family is linked to both the Devon families & the Misterton families. Which includes the Sheffield, Hull & Grimsby Gagg families.