I a sorry but there is not one shred of evidence to prove that any Ferris or Farris is descended from the Ferrers. The notion might make one feel good, but there is no evidence.
As regards Margaret Hextall (Heckstall)
Henry Ferrers of Hambleton Rutland County born 1440 in Tamworth Castle Died Dec 28, 1500, buried In Parish Church at Peckham married said Margaret Hextall (Heckstall) Issue: Elizabeth Ferrers married James Clerke Anne Ferrers married Valentine Knightley Edward Ferrers of Baddesley Clinton (the manor is still standing) married Constance Brome Issue: Henry who married Katherine Hampden Urusula, Jane, Edward and Nicholas Ferrers of Princethorpe (Prinstrope)
Nicholas married Margaret ? issue Edward Ferrers there is no record of the marriage of Edward nor his issue:
I don't know how to address one's religious beliefs, except that there is nothing to any connection between the bible and the name Ferrer or Farrar.
Ferrer has its roots in the latin Ferrum.Ferrum (iron) is the etymological source of many words in French, Spanish, English including Ferreries (a district in Normandy noted for it's iron and iron working).