[Laeral]

I personally don't think 'Loyal Swan' sounds right. The idea behind the name seems sound to me, though. How about the "Fidelity Swan"?

Noted regarding the 'Snowfall Swan' and the 'Bugler Swan'. The word 'bugler' bring up some memories for me- I once created the character of an eager young naval officer named Nelson Bugler, based upon Horatio Hornblower.

From the list of names you've presented for the saw-billed seabird, I think 'Eastern Sawbill' would be most appropriate.