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What is correct Nicholas' or Nicholas's
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It is pronounced 'Nicholas-ess', and actually, modern names should take the 's: Nicholas's. Its omission is only used for certain classical and Biblical names: Moses', Jesus', Socrates'.

Comments  
The former, Nicholas', is correct.
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So do you pronounce it as "Nicholas-ess" or just "Nicholas”?
 Mister Micawber's reply was promoted to an answer.
Nicholas's, pronounced Nicholas-iz.

CJ
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