In Disney’s 1998 animated film Mulan, Mulan’s family surname is Fa.
The name appears in character names such as Fa Mulan, Fa Zhou, and Fa Li. The film’s version of the family is therefore commonly called the Fa family in English-language references and credits.
The surname helps distinguish the animated film from Disney’s 2020 live-action adaptation. In that version, the heroine is generally called Hua Mulan, and her father is Hua Zhou. The change reflects a different naming choice rather than a change to the basic family relationship.
The traditional Ballad of Mulan does not provide a universally fixed family surname for the heroine. Consequently, Fa is specifically the surname associated with Disney’s 1998 animated continuity, not a definitive surname from every historical or literary version of the legend.