18.12.6.20:03: WHY NICHOLAS WITH AN H?

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Above: 'Nicholas' in Tangut as 4884 2946 5560 0493 2ni4 1ko1 1la1 2sy4

Saint Nicholas died 675 years ago today. I would expect the ch of Nicholas to correspond to Greek chi, but in fact it corresponds to Greek kappa in Νικόλαος <Nikólaos>. Wiktionary says the English name was borrowed from Old French Nicholas. Since the Latin form of the name is Nicolaus, why isn't the English name †Nicolas?

My guess is that Nicholas originated in France as a hyper-Hellenicism: 'Greek use ch. This name is Greek. So it must have ch.' But it originally didn't!

Aren't there other Latin words with ch for Greek k? And/or other hyper-Hellenicisms? I can't remember. I vaguely recall Nicholas Ostler's Ad Infinitum: A Biography of Latin had something to say about this, but I don't have my copy on hand.

In any case, the h has now spread within English to the feminine Nichole which seems to date from the 1960s.

Three other mysteries involving this name:

Why do the Czech, Slovak, and Hungarian forms end in [ʃ] rather than [s]? Is Hungarian s [ʃ] instead of sz [s] a spelling pronunciation of Latin s? Did the Hungarian form spread westward?

Why is the Ligurian form Nichioso with -chi- [ki]? Does *-ico- regularly become -ichio- in Ligurian?