kiddy

The word "kiddy" is an informal, affectionate term for a child, emerging in the 19th century as a playful diminutive of "kid." The base word "kid," originally meaning a young goat, began to be applied humorously to children in the late 16th century, a semantic shift likely influenced by the perceived playful and frisky nature of both. The addition of the "-y" suffix, a productive pattern in English for creating familiar or endearing forms (as in "daddy," "doggy"), softened the term further, cementing its use as a colloquialism for a young child. Thus, "kiddy" carries the literal sense of "a little kid," blending the metaphorical use of "kid" for a child with a classic diminutive suffix.

This word is a simplex form. It is a diminutive alteration of the word "kid," which itself is of uncertain origin, possibly from Old Norse "kið" meaning "young goat." The "-y" or "-ie" suffix is a common English diminutive ending used to form pet names or terms of endearment.