The Scots word ‘Seelie’ derives from the Anglo-Saxon (ge)sælig/ sællic meaning ‘happy’ or ‘prosperous.’
The Seelie and Unseelie courts are particular feature of Scottish folklore.
‘Seelie’ also coming from ‘Silly’ To be foolish, laughable, naive.
The name “coot” was “originally given vaguely or generically to various swimming and diving birds.
It then evolved in English from the name for a bird to a noun for an eccentric or crotchety old man!
And so the meaning of SEELIE COOT is to be a silly, happy, (perhaps foolish) and eccentric old bird!