The Parts of Lindsey was a unit of local government until 1974 in Lincolnshire, England, covering the northern part of the county. The Isle of Axholme, which is on the west side of the River Trent, has normally formed part of it. The district's name originated from the Kingdom of Lindsey of Anglo-Saxon times, whose territories were merged with that of Stamford to form Lincolnshire.
When the English shires were established, Lindsey became part of Lincolnshire. It and each of Kesteven and Holland, acquired the formal designation of Parts of Lincolnshire. Thus it became the Parts of Lindsey.
In the late 19th century, the surname gave rise to the given name Lindsay (and variants Lindsey, Lyndsy, etc.) in the United States, at first as a male given name, and since the mid-20th century increasingly as a female given name. Its popularity as a girls' name is due to the actress Lindsay Wagner (born 1949 as Lindsay Jean Wagner), who became famous in 1976 as The Bionic Woman. It was the 314th most popular name for girls born in the United States in 2007, having ranked among the top 200 names for girls from the 1970s through the 1990s. The alternative spelling Lindsey ranked as the 226th most popular name for girls born in 2007 in the United States.
The surname is ultimately connected to the Anglo-Saxon kingdom of Lindsey.