What sources tell us Guillaume died young? "circa 1695 (7-23) Stellenbosch, Cape of Good Hope (Died young)"
http://huguenots-france.org/france/refuge/afrique_sud/embarques.htm has him marrying Catharina van der Zande on 27/03/1712.

What sources tell us Guillaume died young? "circa 1695 (7-23) Stellenbosch, Cape of Good Hope (Died young)"
http://huguenots-france.org/france/refuge/afrique_sud/embarques.htm has him marrying Catharina van der Zande on 27/03/1712.
Linda Magdalena Engelbrecht, can you find that record? Gysbert doesn't sound particularly French - maybe a transliteration of Guillaume? Then your record might be the reason people figured Guillaume died.
Hang on, I found it in Oude Kaapsche Familien
826— van de SANDE.
(b) 1 Catharina, gehuwd met Gijsbert le Febre
2 Nicolaas, gedoopt 5 Juli 1716
https://archive.org/stream/OudeKaapscheFamilienPart3/OudeKaapscheFa...
----------------------
Ja, the Sources seem to be the problem in this area.
There's something for Gysbert in this one:
Gysbert le Febre but I keep losing connectivity down here at the coast, so I'll have to come back to it later, unless one of you can see it.
MOOC10/1.99
Sande, Reijnier van der
17170503
Reijnier van der Sande
3 Maij 1717
De Chavonnes
Vendu rol der goederen naargelaten en met ’er dood ontruijmt bij wijlen Reijnier van der Sande, ten voordeele
van desselfs naargelatene huijsvrouww Hendrina van Hoedingh, en desselfs naargelatene kinderen, als
in voorig huwelijk verwekt bij voorn: overledene en desselfs
eerste huijsvrouw Elsje Basson
Gijsbert la Febre in huwelijk hebbende
Catharina van de Sande, en
in huwelijk verweckt bij desselfs laaste huijsvrouw Hendrina van
Hoetingh voorn:t
etc.
There's quite a bit on FS for Gysbert. Here's just a few of them. Also under different spelling.
Name Michiel Le Febre
Event Type Baptism
Event Date 08 Jul 1736
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gysbert Le Febre
Mother's Name Catharina Van Santen
Name Gijsbert La Febre
Event Type Baptism
Event Date 23 Mar 1727
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gysbert La Febre
Mother's Name Catharina Van Den Sande
Name Gÿsbert Lafebre
Event Type Baptism
Event Date 08 Dec 1743
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Rijnier Lafebre
Mother's Name Antonia Alida Lever
Name Gijsbert Lafebre
Event Type Baptism
Event Date 18 Jun 1769
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Jacobus Alexander Lafebre
Mother's Name Christina Jacoba De Wet
Name Johannes La Febre
Event Type Baptism
Event Date 21 Apr 1720
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gysbert La Febre
Mother's Name Catharina Van Santen
ame Johanna Lafevre
Event Type Baptism
Event Date 14 Aug 1718
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gysbert Lafevre
Mother's Name Catharina Van Der Zande
Name Jan Adriaan La Febre
Event Type Baptism
Event Date 06 Jun 1728
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gysbert La Febre
Mother's Name Catharina Van Der Sande
Name Helena La Febre
Event Type Baptism
Event Date 07 Dec 1732
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gijsbert La Febre
Mother's Name Catharina Van Der Sande
Name Maria Alida Lafebre
Event Type Baptism
Event Date 10 Jun 1731
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gijsbert Lafebre
Mother's Name Catharina Van Der Sande
Name Jacomina La Febre
Event Type Baptism
Event Date 26 Mar 1730
Event Place Cape Town, Cape of Good Hope, South Africa
Father's Name Gysbert La Febre
Mother's Name Catharina Vander Sande
Maybe somebody with a subscription to this site can help:
https://www.wiewaswie.nl/en/search/search-results/q/le%20Febre
Thanks Charmaine, you're a star! I wonder if we'll ever be able to find out if he changed his name? Delia Robertson, do you have an opinion on this?
The muster/tax rolls for the Cape/Stellenbosch shows Pierre le Febre and Maria de Grave with no children in 1684, 1 daughter in 1685 and eventually with up to 3 daughters. Once the daughters got married, they are listed without children (last record in 1707.
Sources:
1684:
https://www.nationaalarchief.nl/onderzoeken/archief/1.04.02/invnr/4...
1685:
https://www.nationaalarchief.nl/onderzoeken/archief/1.04.02/invnr/4...
If Guillaume did exist he must have passed away before this first record at the Cape occurs.
Gijsbert le Feber is the individual who married Catharina van der Sande.
Source:
https://familysearch.org/ark:/61903/3:1:S3HY-DZN4-47W?cc=1478678&am...
He arrived at the Cape as a soldier in 1709 from Overshie. His soldyboek can be found here:
https://www.nationaalarchief.nl/onderzoeken/archief/1.04.02/invnr/1...