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- Xerox – named from xerography, a word derived from the Greek xeros (dry) and graphos (writing). The company was founded as The Haloid Company in 1906, launched its first XeroX copier in 1949, and changed its name to Haloid Xerox in 1958.
- XIX Entertainment – XIX is 19 in Roman numerals, so the company is named indirectly after Paul Hardcastle's single 19, and directly derived from 19 Entertainment – see above.
- Xobni – inbox, backwards
- XTO Energy – Founded in 1986 as Cross Timbers Oil Company, it went public under the stock ticker XTO, and changed its name to XTO Energy Inc in 2001. It is now owned by Exxon Mobil.
Read more about this topic: List Of Company Name Etymologies