I try to follow the Chicago Manual of Style, so for me it’s Travis’s. Generally that’s the style guide used in fiction.
The Associated Press Stylebook just puts an apostrophe at the end of a proper noun ending with “s,” however (although they will use an apostrophe-ess for common nouns, creating things like scissors’s).
Depends on the style guide.
I try to follow the Chicago Manual of Style, so for me it’s Travis’s. Generally that’s the style guide used in fiction.
The Associated Press Stylebook just puts an apostrophe at the end of a proper noun ending with “s,” however (although they will use an apostrophe-ess for common nouns, creating things like scissors’s).