‘Irish: Americanized form of Ó Muirgheasa ‘descendant of Muirgheas’, a personal name apparently derived from muir ‘sea’ + geas ‘taboo’, ‘prohibition’.
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Morrissey is the forbidden sea?
makes sense, like that.
“all the things I need
and the things I receive
is an ancient ocean
wide, wild, lost, uncrossed”
Spell or curse is the more usual translation... but forbidden sea does suit him.