References. The Threlkeld Family Crest was acquired from the Houseofnames.com archives. The Threlkeld Family Crest was drawn according to heraldic standards based on published blazons. We generally include the oldest published family crest once associated with each surname.irst found in Cumberland, where they held a family seat as Lords of the manor of Threlkeld. Today, Threlkeld is a village and civil parish in Cumbria, east of Keswick. The Threlkeld Quarry and Mining Museum is now located there attesting to the long history of mining in the area.