Hallie is an English feminine given name that originated as a hypocorism for the name Harriet.
Young children often have difficulty in pronouncing the letter r, which resulted in nicknames that substitute the letter l for r. Other examples include Dolly for Dorothy, Lolly for Laura, Molly or Polly for Mary, and Sally for Sarah.
[1][2] The name is also occasionally regarded as a variant of Hayley.
[3]