English: occupational name for a sexton or churchwarden, from
Middle English sexteyn ‘sexton’ (Old French secrestein,
from Latin sacristanus).
Irish (Munster and midlands):
reduced Anglicized form of Gaelic Ó Seastnáin ‘descendant
of Seastnán, Seasnán’, a personal name meaning
‘bodyguard’, from seasuighim ‘to resist’, ‘to defend’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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