Many online trees, and even some late 19th/early-mid 20th century genealogies, claim he was the son of one Sir Ellis Hicks (b 1315), but he could not have been, because John was born 140 years later.
In seeking the original source of the claim that John was son of Sir Ellis, we find an 1811 publication that says:
Therefore, this John was not SON of Sir Ellis Hicks (if Ellis existed at all), but a DESCENDANT of Ellis.
John Hicks was born about 1455 possibly in Fortesset, Gloucester, England.[citation needed]
He died in 1492 in Gloucester, England.[2]
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files.www.usgwarchives.net/mi/kent/bios/amyhic01.txt
https://archive.org/stream/familyofhicks00ruvi/familyofhicks00ruvi_djvu.txt
www.yanceyfamilygeneology.org/Book_Sir_Ellis_Hicks.pdf