Hillier \hi(l)-lier\ as a boy's name is a variant of Hillard (Old German), and the meaning of Hillier is "hard warrior".

The baby name Hillier sounds like Hillyer and Hiller. Other similar baby names are Hillierd, Helier, Collier, Hallie, Heller, Hilliary, Hillery, Hilliard, Hillel and Miller.