"Blend of Lee and Ann"
The name Leiann is commonly a female name.
Leiann is formed from the given names Lee and Ann, the same combination that produced the English spellings Leeann, Leanne and LeAnn. The second element is plainly the name Ann; the Lei- opening is one of several spellings used for the Lee element in this combination. The name entered United States birth records in 1956, which fits a combination formed in modern English rather than an older inherited name.
The pronunciation of Leiann is lee-AN.