The family of St. Leger (/ˈsɛlᵻndʒər/ SEL-in-jər) (Latinized to De Sancto Leodegario) is an old Anglo-Irish family with Norman roots, that in some cases transformed into Selinger or Sellinger). It is first recorded in England as lord of the manor of Ulcombe in Kent. John St Leger (died 1441) of Ulcombe was Sheriff of Kent in 1430.
The surname St. Leger is recorded in several forms This surname is originally toponymic in origin, indicating that the individual was from a location that had been dedicated to St. Leger. The name ultimately derives from the pre-7th-century Old German personal name Leodegar, composed of the elements liutr (tribe), and gari (spear). St. Leger, a 7th-century martyr and bishop of Autun, contributed to the popularity of the name in France, while in Germany the name was connected with a different saint, Ludger, an 8th-century bishop of Münster.