How to pronounce Jamesyn?

J-A-me-syn
A lot of people mistake it for the name jasmine. But the people who do are wrong. Also Jamesyn and Jameson are two completly different names.
The syn in Jamesyn, has to be said like Jamesin. Except the i is a y.
Jameson is a much more common name than Jamesyn
The son in Jameson is said like son, and that's the difference between Jamesyn and Jameson.

First Name, Last Name, Name of the River, Name of

American

I have no idea

Nope