Diminutive of Letitia, from Latin 'laetitia' meaning joy or happiness.
Letty is usually a diminutive of Letitia, Laetitia, or related names descending from the Latin laetitia, meaning “joy,” “gladness,” or “happiness.” That origin gives it one of the most straightforwardly cheerful meanings in the naming tradition. Yet Letty does something interesting to that inheritance: it takes the formal, slightly ceremonial Letitia and turns it into something brisk, affectionate, and bright.
The result is a nickname that has long been able to stand on its own, especially in English-speaking settings where pet forms often become independent names. Historically, Letty has the cozy feel of the eighteenth and nineteenth centuries, when shortened household forms circulated in letters, novels, and family life. It appears in literature and period drama often enough to carry a faintly bonneted, candlelit atmosphere, though never so heavily that it feels trapped in the past.
It can also be linked to Lettice, another older English name with a different etymological path but a similar sound, which has helped Letty remain flexible in usage and association. In modern culture, Letty has acquired an additional edge through fictional bearers such as Letty Ortiz in the Fast & Furious films, who gave the name a tougher, more contemporary image. That contrast is part of its appeal: underneath, it still means joy, but it no longer sounds merely dainty.
Over time the name has shifted from obvious nickname to vintage standalone choice, beloved by parents who like short names with history. Letty manages a rare balance. It is cheerful without being childish, old-fashioned without being fragile, and literary without requiring explanation. It is, in essence, joy translated into a voice that sounds lively and human.