The name Leigha is a relatively modern variant of the name Leigh, which has its roots in the Old English word "leah" meaning a meadow, clearing, or field. The name was initially used as a surname in England, referring to someone who lived near or in a meadow.

In the 12th century, the name Leigh began to be used as a given name, particularly for boys. It was a popular choice among the Anglo-Norman nobility and gentry. One of the earliest recorded instances of the name Leigh being used as a given name dates back to 1182, when a man named Leigh de Longchamp was mentioned in the Pipe Rolls of Lincolnshire.

The name Leigha emerged as a variant spelling of Leigh in the late 20th century, likely as a way to add a more feminine touch to the traditionally masculine name. While the name Leigh has a long history, the spelling Leigha is relatively modern and does not have any significant historical references or notable bearers from earlier periods.

One of the earliest recorded instances of the name Leigha can be found in the 1940s. Leigha Bingham, an American actress, was born in 1948 and appeared in several television shows and films during the 1970s and 1980s.

Another notable bearer of the name Leigha was Leigha Brown, an Australian sprinter who competed in the Commonwealth Games and represented Australia in the 1996 Summer Olympics in Atlanta.

In literature, the name Leigha was used for a character in the novel "The Spiral Staircase" by Karen Armstrong, published in 2004.

While the name Leigha is not as common as its parent name Leigh, it has gained some popularity in recent decades as a unique and feminine alternative to the traditional spelling.