Name help!

Fiona • Blessed mom of almost 3! Girl and two little boys with my youngest son to arrive next month!

We are so stuck on a name for our little man! We have 3 top choices but are open to anything else with a Celtic origin (Scottish or Irish)

1. Damien Niall

2. Caelan Niall

3. Rhys Niall

Our other two kids are Aurora and Jameson. Any help appreciated!