What is Nellie Oleson's real name?

Nellie Oleson is a fictional character from the "Little House on the Prairie" series, and she is portrayed by actress Alison Arngrim in the television adaptation. In the books written by Laura Ingalls Wilder, Nellie's character is based on a real person named Nellie Owens. Arngrim's portrayal of Nellie Oleson became iconic, representing the classic "mean girl" archetype in the series.