Near Ilton and Puckington, the Isle is joined by Cad Brook. The name of this stream is first attested in a thirteenth-century copy of a perhaps tenth-century forgery of a
charter purporting to date from 725, as . The name is attested again in the fifteenth century as
Cadde. The second element of this name is an
Old English word meaning "stream", the origin of the first element is less certain. In 1928,
Eilert Ekwall guessed that
Caduc was a
diminutive form of a
personal name Cada, thus meaning "Caduc's stream". By 1936 he had concluded that the name included a rare Old English word for
jackdaw, , in which case the river name meant "jackdaw stream".
Andrew Breeze has more recently suggested that
caduc was actually a
Brittonic name for the stream, adopted into Old English with
burn as an explanatory addition, related to the Modern Welsh word
caddug ("mist, gloom, darkness"). The stream gave its name to the hamlet of
Cad Green. By the 1920s, the stream itself seems to have been called the Ding, but recent maps show
Cad Brook, suggesting that Cad Green has in turn given its name back to the stream from which it was named. ==References==