hærfest-mōnaþ, m.n: harvest month, September. (“har-vest-mon-ath”)
Kazutomo Karasawa says, ‘These records [i.e. Bede and Old English Martyrology] suggest that the month-name [Haligmonað] is related to the heathen harvest festivals, which are often said to have been held around the autumnal equinox in the latter half of September.’ Ælfric’s Grammar XVIII calls the month of September hærfestmonoð ‘harvest-month’.**Kazutomo Karasawa, The Old English Metrical Calendar (Menologium) (Cambridge: D. S. Brewer, 2015), pp. 116-17.