On 30/07/15, at 21:27, Alain wrote:
> Le 15-07-30 10:35, Jellby (POV-Ray) a écrit :
>> On 30/07/15, at 11:35, Warp wrote:
>>>
>>> (According to most English style guides, the possessive of proper names
>>> should always use 's, even if the name ends in s. Thus it's for example
>>> "workers' rights" but "Fitts's law".)
>>>
>>
>> Unless the law is named after several people named "Fitt", I guess.
>>
>
> Last time I checked, proper names are always invariable. At least, they
> are in French, and as English borrowed many grammatical rules from
> French along with a few 1000s words, having that rule been identical
> would have a prety high probability.
> You have the Fitt family and the Fitts family.

Not in English, as far as I know:

https://en.wikipedia.org/wiki/The_Simpsons

Yes, you'd have "the Fitt family" and "the Fitt brothers", both of which 
could be referred to as "the Fitts" (the Fitts family would be "the 
Fittses")

http://grammarist.com/style/last-names/

As I see it, it would be:

Fitt's -> belonging to one Fitt
Fitts' -> belonging to several Fitt
Fitts's -> belonging to one Fitts
Fittses' -> belonging to several Fitts

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