Pet form of Katherine, also frequently used as an independent given name, which has been extremely popular since the 1980s. It is often found in combination with other names such as Ann, Jane, Leigh, Louise, and Mae.
Origin uncertain. 1. Probably of English origin, a topographic name from Middle English evre ‘edge of an escarpment’, ‘brow of a hill’, Old English (unattested) yfer. 2. Alternatively, perhaps a variant of Scottish Ure.