Quote from stu:
BUT ...say my name is Jones. If I have a book it is referred to as Jones's book. If I write Jones' book I am saying the book which belongs to all the people named Jones.
I checked a few sources and you appear to be right, although for famous names, the s' is preferred over s's -- which means my use of Jesus' was acceptable.
But a singular noun or name ending in âsâ is not normally an exception along with this shifting rule; so âthe horse of Jamesâ becomes âJamesâs horseâ, and âlensâ takes a possessive in âlensâs.â Be aware, though, that some names ending in âsâ (especially classical ones for some reason- maybe theyâre too far above us poor modern mortals in sheer heroic scope to disdain the use of an apostrophe that doesnât make room for them) seem to prefer the use of a shifted apostrophe; âHerculesâ house was very big.â
http://www.abctales.com/abcplex/viewfeature.cgi?f=40
"Notice that names ending with âSâ get an apostrophe after the last letter of the name and then another âSâ to indicate possession. This is the British and Canadian method. American English tends not to add the âSâ and this partly accounts for the inconsistency which is so common."
http://www.wlu.ca/~wwwphil/mcnulty/grammar.html
"But note: While these second examples still represent the rule, as the English language evolves, it is becoming more common and acceptable to add only the apostrophe to a singular noun (usually somebody's name) that already ends with an 's'. This would be written as Charles' bag and the Jones'. So for singular nouns already ending with an 's', you can use either form and it will be correct."
http://www.commerce.otago.ac.nz/finc/writewell/grammar7.html
It's party time