Allison

Allison is commonly used as a spelling of Alison, an old diminutive of Alice. Through that route it belongs to a Germanic name family associated with nobility. Allison also appears as a surname, so interpreting every example literally as “son of Allen” would miss the established Alice connection of the given name.

Allie and Ally are familiar short forms. Alison uses one l, while Allyson makes another spelling choice without requiring a different pronunciation. For a family honoring an Alice, Allison can retain the connection in a longer form. Parents can also compare the full name with the nickname they expect to use most often.