From an English surname that meant "dispenser of provisions", derived from Middle English spense "larder, pantry". A famous bearer was American actor Spencer Tracy (1900-1967). It was also the surname of Princess Diana (1961-1997).
Norman French diminutive of Aalis (see Alice) [1]. It was common in England, Scotland and France in the Middle Ages, and was later revived in England in the 20th century via Scotland. Unlike most other English names ending in son, it is not derived from a surname.