Kaisen ~ Derivative of Kasey: English for alert, vigorous, or spirited.
Brynn ~ Welsh for hopeful.
We chose Kaisen Brynn for our little girl.
We liked Kasey, but decided we wanted something a little more modern. Lynn was nice but just wasn't 'the one', so we added -en to Kasey and added the br- to lynn to make a a special name for our daughter . . . Kaisen Brynn.