ETYMOLOGY
from grim (adj.) + sir, sire
EXAMPLE
“…And I, Baruk prophete, conferme wurdys thes,
Lord and prince of pes, thow that chylde be,
Al his fomen ageyn hym that pres,
Ryght a grym syre at domysday xal he be. …”
From: Ludus Coventriæ, A Collection of Mysteries, c1450
The Prophets
Printed for the Shakespeare Society, 1841
Lexicophilia 