If a surname ends in 's' (in a similar way to the name 'James') and you want to say the idea that belonged to, for example, James. Would you say James' or James's. On the internet some people say, Jameses, which surely has to be incorrect.
There are differing views and the rules are not consistent/logical. Some say St Thomas', some say St Thomas's. I always go off what it sounds like. If someone is called Mr Ross I would say Mr Ross's house because that's what you say. But there is no right and wrong answer.
Why do you need to know?
not sure but think its got something to do with the S following a consonant or a vowel ie Its Mr Ross's car or its Mr James' car -but knowing the English language its probably got loads of exceptions.
Jameses is definitely wrong, unless you mean the James family: keeping up with the Jameses or Joneses.
Strictly, the rule in writing is to put 's after a surname ending in s, so it's Saint James's. In speech, it is sometimes easier to say the possessive without the extra s sound, but that is a matter of casual or informal use, not a rule.
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