Jones is a surname of English and Welsh origin meaning "son of John". The surname is common in Wales. It evolved into variations of traditionally Welsh names: Ieuan, Iowan, Ioan, Iwan, or even Siôn (note how the letter 'J' was originally being pronounced as 'i', akin to how J is pronounced in the Latin alphabet). The sound generated from ‘Si-’ in Siôn is a Welsh approximation of the English ‘J’ sound that does not exist natively to the language (refer to Irish Seán), equivalent to the English ‘Sh’ such as in “shed.”