I have been told that I should be writing Ross's and not Ross' when writing the possessive form. Well I always wrote Louis' not Louis's. Anyway what you find on google is amazing ..
"Even if the name ends in “s,” it is still correct to add an “'s” to create the possessive form. It is also acceptable to add only an apostrophe to the end of singular nouns that end in “s” to make them possessive. In this case, that means Ross' would have the same meaning as Ross's.”
Acceptable, correct, I will continue to do it .. Stick that then!
Ross' tongue sticking out on a walk!!!! lol