A surname-style modern name likely related to Hensley, originally from an English place name meaning hen's meadow.
Henslie is a tender and uncommon variant of the surname Hensley, itself derived from the Old English place name elements "Hengist's lēah" — the woodland clearing of Hengist — or possibly from a clearing associated with a family patriarch. Hengist, meaning "stallion" in Old English, was notably the name of one of the legendary Anglo-Saxon brothers, Hengist and Horsa, who according to the Venerable Bede led the Germanic tribes' migration into post-Roman Britain in the fifth century. Whether or not that etymology is directly invoked, the name carries a subtle thread of early English history.
As a given name, Henslie softens the blunt energy of Hensley with a more delicate spelling, the -ie suffix lending it a warm, intimate quality similar to the way Millie, Ellie, or Rosalie feel approachable and affectionate. This is a naming instinct with deep roots: diminutive or softened forms of surnames have been used as given names in English-speaking cultures since at least the Victorian era. The result here is a name that feels simultaneously antique and modern — at home in a family tree alongside an ancestor's surname and equally at home in a twenty-first century classroom.
Henslie remains genuinely rare, which is often exactly what draws parents to it. It offers the warm familiarity of a surname name without the overexposure of a Hadley or a Hartley, and its slightly unconventional spelling ensures a bearer is unlikely to share the name with anyone in their orbit.