| xa | xado (54), xantus (28), xavi (7) |
| xb | xbox (460) |
| xc | xc (195), xco (14) |
| xd | xd (94) |
| xe | xerox (205), xenon (201), xeon (53) |
| xé | xénia (46) |
| xf | xf (45) |
| xg | xgt (17) |
| xi | xi. (2106), xiaomi (602), xi (320), xiii (206), xiv (172), xii (160), xix (129), xilit (68), xixo (33), xing (21), xilion (6) |
| xl | xl (961), xls (90), xlr (82), xl-es (60), xlsx (45) |
| xm | xml (294), xm (23) |
| xo | xo (36) |
| xp | xps (255), xp (187), xperia (53), xpress (40), xpro (23), xpe (15), xpel (9) |
| xr | xr (138), xrp (27) |
| xs | xs (326), xsara (41), xsd (20) |
| xt | xtreme (213), xt (186), xtremedia (15) |
| xv | xv. (1226), xvi (168), xv (164), xvii (152), xviii (137) |
| xx | xx. (1343), xxl (743), xx (201), xxi (158), xxx (145), xxii (106), xxiii (79), xxxl (73), xxl-es (51), xxxlutz (43) |
| xy | xy (84) |
| x. | x. (1405) |
| x- | x-faktor (87), x-trail (30) |