| xa | xander (159), xa (73), xandres (63), xaverius (10) |
| xb | xbox (269), xbrl (9) |
| xc | xc (71), xcover (28), xclusive (24), xco (14), xcams (8) |
| xd | xd (120), xdrive (28) |
| xe | xerox (71), xenon (66), xenos (37), xenia (34), xena (23), xen (13), xenical (8), xeno (8) |
| xf | xf (45) |
| xi | xiv (64), xi (63), xii (54), xiii (50), xin (15) |
| xj | xj (58) |
| xk | xk (44) |
| xl | xl (2203), xlr (42), xlc (28) |
| xm | xml (248), xml-rpc (31) |
| xo | xo (44), xooon (32) |
| xp | xp (149), xpo (129), xps (98), xperience (48), xpert (47), xpress (41), xplore (21), xpel (16) |
| xr | xr (346), xrp (108) |
| xs | xs (447), xsensible (46) |
| xt | xtra (155), xt (128), xtreme (83), xtc (68), xtr (25), xterra (8) |
| xv | xv (101) |
| xw | xwift (6) |
| xx | xxl (1205), xx (320), xxx (220) |
| xy | xyz (41) |
| x. | x. (92) |
| x- | x-mas (54), x-treme (36), x-ray (35), x-line (15), x-trend (10) |