'head-related' originates from the combination of 'head' and 'related', where 'head' refers to the upper part of the human body or the front part of an animal's body, and 'related' means connected or associated.

'head' and 'related' have been used in English since Old English and Middle English periods, respectively, and combined to form 'head-related' in modern English.

Initially, 'head' referred to the physical part of the body, and 'related' meant connected. Together, they evolved to describe anything associated with the head.