Letters J, K, W, X and Y are not part of the proper alphabet, and are used only for loanwords and foreign names (with very few exceptions, such as in the native names Jesolo and Bettino Craxi).
However, 'x' is only found in loanwords, as it is not part of the standard Italian alphabet; in most words with 'x', this letter may be replaced with 's' or 'ss' (with different pronunciation: xilofono/silofono, taxi/tassì) or, rarely, by 'cs' (with the same pronunciation: claxon/clacson).
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