| Jchcz Brown Baltaiuk Kimbilio | ♂ | 2016 | – | – | CMKU/AKE/386/16 | ♂ Bwaókiya Nagi z Lothecke Linie | ♀ Against The Wind |
| Jekku Rebell Represent | ♂ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/854/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Jekyll Rebell Represent | ♂ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/855/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Jessie Brown Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/449/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Jessie Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/820/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jessie Xapatan | ♀ | 2014 | CZ | Jiří Tancer | CMKU/AKE/277/14 | – | ♀ Foxy Xapatán |
| Jet Kelpiebrink | ♀ | 2019 | NL | – | NHSB3153187 | – | ♀ Morrigan Kelpiebrink |
| Jewel Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/821/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jimboomba Break The Silence Marshmello | ♂ | 2026 | NL | – | NHSB3379728 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Djalu | ♀ | 2026 | NL | – | NHSB3379733 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Karmeliet Brewed With Patience | ♀ | 2026 | NL | – | NHSB3379732 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Lightning Salto | ♀ | 2026 | NL | – | NHSB3379731 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Power of Amber Stone | ♀ | 2026 | NL | – | NHSB3379730 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Run To Me | ♀ | 2026 | NL | – | NHSB3379729 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Whoopee Dreams Come True | ♀ | 2018 | NL | – | NHSB3142014 | – | – |
| Jimy Jack Devil of Highland | ♂ | 2023 | CZ | – | CMKU/AKE/795/23 | – | ♀ Chimi Changa Devil of Highland |
| Jo-Jo Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/450/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Joke for Mind Rebell Represent | ♀ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/858/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Joker Kelpiebrink | ♂ | 2010 | NL | – | NHSB2807143 | ♂ Almdalens Simon | ♀ Kiwi Kelpiebrink |
| Joko Dai Muratori | ♂ | 2023 | CZ | – | CMKU/AKE/817/23 | – | ♀ Hasty´s Hope Dai Muratori |