Thomas FIELD - 1820 Settler

[J.J.]

Dennis perhaps it said 1893 for the birth, 5's & 3's getting mixed up...
Extracted IGI 
THOMAS FIELD  Christened  April 19th 1795 - St Giles Cripplegate, London, England
Parrents ISAAC FIELD and NELLY
( Nelly can be shortening of Eleanor, Elenora, Ellen, Helen also Anabel, Annabelle, Annabel & Cornelia  )

Your url didn't go to the page source...and  http://www.southafricansettlers.com/?cat=16&paged=6 is where I found Samuel & William but not Thomas...
also an Ann Field born England 1821 http://www.southafricansettlers.com/?cat=16&paged=25

[J.J.]

Perhaps it is Ann, then as these are extracted christenings for an Isaac father St Giles Cripplegate, London:
Isaac FIELD July 29 1787 with mother as Ann
Henry FIELD March 15 1789 - Ann
Rosetta FIELD May 22 1791 - Ann 
John FIELD - April 19 1795 also says mother Nelly same day as Thomas

I wonder if you might be related to the famous/infamous John Field, curator of the church in the 16th century, Also there are only a small number of Field births in that church in the 19th century, so if this turns out to be your man, many could be family...None with the name Isaac, however

Guess we may need to look for the spelling as well as found this one
Isaacke FEILD b. May 7 1664  ( christened May 15 / Death Sept. 4 )
St Giles Cripplegate, London / parents Robert & Ann

also noted that 16th century spellings range from Fielde, Feeld, Feelld, feeild, feeild, to Fyelde, Fyelde, Fylde, Flyde, feld, feild, feilde, 

Just realized, this is a very old query, so you probably have this

[J.J.]

Just noted that this publication another Thomas Field arriving with GENERAL CAMPBELL'S SETTLERS in December, 1820 on the Salisbury ( or was it the same man moving back & forth? )  A J.Beddy Field on same page in Lt. Daniell's party
British South Africa - a history of the colony of the Cape of Good Hope, from its conquest 1795 to the settlement of Albany by the British emigration of 1819; with notices of some of the British settlers of 1820
http://www.archive.org/stream/britishsouthafri00camp#page/182/mode/2up