Here are some possibilities:
Based on the French pronunciation:
* Jasson - This is the closest spelling to the English pronunciation.
* Jasson - This spelling reflects the "s" sound at the end of the name.
Other possibilities:
* Giazon
* Jaison
Tips for finding the correct spelling:
* Look for historical records: Check family genealogies, birth certificates, or other historical documents for the correct spelling.
* Contact a genealogist: A professional genealogist can help you research your family history and identify the correct spelling.
Ultimately, the "correct" spelling will depend on the specific family and its history.