Is "Rapport" a genuine Apple App?

You kind of need to be more specific. At the end of the day, an app name is a pretty weak way to identify an app - I could be a malicious hacker who releases a new, cool app called 'Mail.app' - most people wouldn't think twice about telling you that 'Mail.app' is ok because they'd assume you're talking about the official Apple app, not some hacker's tool.

Maybe a link to the app, where you found it, or some other details might help.

You should not install Trusteer. It is required by some financial institutions. I would question the ability of an institution to be secure if they have to rely on customers installing third party apps to keep the institution secure. Uninstall Trusteer it may cause issues on your computer.

Are you asking about Trusteer Rapport or something else?

Trusteer Rapport is an App required by some financial institutions. It is not from Apple, and if installed will cause far more problems than it is meant to prevent.

You’re welcome.