| xa | xado (48), xantus (21) |
| xb | xbox (362) |
| xc | xc (226), xco (13) |
| xd | xd (76), xdrive (33) |
| xe | xerox (194), xen (183), xeon (43) |
| xé | xénia (41) |
| xf | xf (35) |
| xg | xgt (15) |
| xi | xi. (2031), xiaomi (599), xi (215), xiii (180), xiv (153), xix (125), xii (122), xilit (68), xixo (33), xing (23) |
| xl | xl (815), xls (79), xlr (70), xl-es (46) |
| xm | xml (283), xmas (85) |
| xo | xo (27) |
| xp | xps (249), xp (166), xperia (49), xpress (42), xpel (9) |
| xr | xr (122) |
| xs | xs (263), xsara (42) |
| xt | xtreme (214), xt (164) |
| xv | xv (1311), xvi (152), xvii (143), xviii (119) |
| xx | xx. (1272), xxl (639), xx (187), xxx (183), xxi (146), xxii (100), xxxl (78), xxl-es (40) |
| xy | xy (91) |
| x. | x. (1322) |
| x- | x-faktor (73) |