The English surname Slack is of two distinct origins. Firstly the name may be a nickname for an idle person, deriving from the Middle Dutch term slac, Middle English slack, meaning “lazy or careless.” In the second instance the name Slack is a topographic name from northern Middle English slack ‘shallow valley’ (Old Norse slakki), or a habitational name from one of the places named with this word, for example near Stainland and near Hebden Bridge in West Yorkshire. The first recorded spelling of the family name is shown to be that of Gerebod le Slac, which was dated 1195, in the "Pipe Rolls of Lincolnshire." other early recordings include: Nicholas del Slac (1275) Yorkshire, and Thomas Slak (1359) in the Calendar of Letter Books of the City of London.
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