someone wrote that Hindi must have borrowed the word (=canon) from English. More likely, they are both descended from the same proto-Indoeuropean language, as was William Conrad.

Not likely, words that begin with a c in Latin (canna 'tube') or a k in Greek (kanōn 'rule') do not correspond to words in Indic (Hindi and Sanskrit) beginning in k; cf. for instance Latin centum with Sanskrit śatem '100'. The name Conrad is Germanic, and there an initial k does not correspond with initial Latin c; cf. canis 'dog' and hound.

Ceci n'est pas un seing.