Can I give someone my UDID
Can I give my udid # to an app. Developer? I trust my contact but am unsure of others connecting my name and UDIDI #.
If you trust the developer, sure. The UDID is just a unique identifier for your physical iPhone, and the developer needs to register it with Apple so that they can build the app for you. It's not normally tied to you in any way.
Another option: the developer could add the app to TestFlight, and then invite you with your email address. That would be more work for them, though.