Chris's room or Chris' room

[herbivorie]

When someone's name ends with "s", do I need to put "s" after an apostrophe to make possesive form?
If so, how do you pronounce the "s" after the apostrophe, or [z]?

 

[5jj]

Chris's -/ˈkrɪsɪz/ or /ˈkrɪsəz/

 

[MikeNewYork]

When someone's name ends with "s", do I need to put "s" after an apostrophe to make possesive form?
If so, how do you pronounce the "s" after the apostrophe, or [z]?

I prefer "Chris's" because we pronounce the second S. The second has has a Z sound.