| Just Man Xapatan | ♂ | 2014 | CZ | – | CMKU/AKE/281/14 | – | ♀ Foxy Xapatán |
| Jurrasic Joker Rebell Represent | ♂ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/856/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Jupiter Dai Muratori | ♂ | 2023 | CZ | – | CMKU/AKE/818/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jupa Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/452/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Jumbo Roxy Xpatan | ♀ | 2014 | – | – | – | – | ♀ Foxy Xapatán |
| Jumbo Roxy Xapatán | ♀ | 2014 | CZ | Jiří Tancer | ČMKU/AKE/279/14 | ♂ Vinny | ♀ Foxy Xapatán |
| Julissa Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/451/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Joytis Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/453/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Joyce Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/822/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jovie Journey Devil of Highland | ♀ | 2023 | CZ | – | CMKU/AKE/797/23 | – | ♀ Chimi Changa Devil of Highland |
| Joul Xapatan | ♂ | 2014 | CZ | – | CMKU/AKE/280/14 | – | ♀ Foxy Xapatán |
| Jolly Junia Kimbilio | ♀ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/920/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Jolly Jorika Kimbilio | ♀ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/919/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Jolly Joker Devil of Highland | ♂ | 2023 | CZ | – | CMKU/AKE/796/23 | – | ♀ Chimi Changa Devil of Highland |
| Jolly Jeremiah Kimbilio | ♂ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/916/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Jolly Jasmine Kimbilio | ♀ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/917/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Joko Dai Muratori | ♂ | 2023 | CZ | – | CMKU/AKE/817/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Joker Kelpiebrink | ♂ | 2010 | NL | – | NHSB2807143 | ♂ Almdalens Simon | ♀ Kiwi Kelpiebrink |
| 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 |
| Jo-Jo Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/450/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Jimy Jack Devil of Highland | ♂ | 2023 | CZ | – | CMKU/AKE/795/23 | – | ♀ Chimi Changa Devil of Highland |
| Jimboomba Whoopee Dreams Come True | ♀ | 2018 | NL | – | NHSB3142014 | – | – |
| Jimboomba Run To Me | ♀ | 2026 | NL | – | NHSB3379729 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Power of Amber Stone | ♀ | 2026 | NL | – | NHSB3379730 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Lightning Salto | ♀ | 2026 | NL | – | NHSB3379731 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Karmeliet Brewed With Patience | ♀ | 2026 | NL | – | NHSB3379732 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Djalu | ♀ | 2026 | NL | – | NHSB3379733 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Break The Silence Marshmello | ♂ | 2026 | NL | – | NHSB3379728 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jewel Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/821/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jet Kelpiebrink | ♀ | 2019 | NL | – | NHSB3153187 | – | ♀ Morrigan Kelpiebrink |
| Jessie Xapatan | ♀ | 2014 | CZ | – | CMKU/AKE/277/14 | – | ♀ Foxy Xapatán |
| Jessie Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/820/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jessie Brown Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/449/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Jekyll Rebell Represent | ♂ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/855/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Jekku Rebell Represent | ♂ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/854/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Javelin ATGM Rebell Represent | ♀ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/857/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Jata Black Mount Mckinkey | ♀ | 2017 | CZ | Marcela Nováková | ČMKU/AKE/448/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Jarrah Baralga Warrigal | ♂ | 2013 | NL | – | NHSB2937860 | ♂ Mountainmist The Fugitive | ♀ Numbat Merinda Warrigal |
| Jango Xapatan | ♂ | 2014 | CZ | – | CMKU/AKE/279/14 | – | ♀ Foxy Xapatán |
| Jakari Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/819/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jaimie Xapatan | ♀ | 2014 | CZ | – | CMKU/AKE/282/14 | – | ♀ Foxy Xapatán |
| Jaenela Kelpiebrink | ♀ | 2021 | NL | – | NHSB3224893 | – | ♀ Femke Caobrink |
| Jack Sparrow Rebell Represent | ♂ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/853/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Jack | ♂ | 2015 | FI | – | ER28745/19 | ♂ Bamba Toohey | ♀ Kataran Cass |