| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 901 | Jocelyn | German | One of the Goths. | F | |
| 902 | Jocelyn | German | One of the Goths. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | M | |
| 903 | Johan | German | German form of John. | M | |
| 904 | Johann | German | Variant of the Hebrew John 'Jehovah has been gracious; has shown favor.'. | M | |
| 905 | Johanna | German | German form of Joanna. | F | |
| 906 | Johannah | German | Variant of Joan. | F | |
| 907 | Johannes | German | German form of John. | M | |
| 908 | Jolan | German | CountIy. | F | |
| 909 | Jolanka | German | CountIy. | F | |
| 910 | Joli | German | CountIy. | F | |
| 911 | Joscelin | German | START Variant of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | F | |
| 912 | Joscelin | German | Variant of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | M | |
| 913 | Josef | German | German form of Joseph. | M | |
| 914 | Josefa | German | Feminine of Joseph. | F | |
| 915 | Joss | German | Diminutive of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | F | |
| 916 | Joss | German | Diminutive of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | M | |
| 917 | Jurgen | German | German form of George. | M | |
| 918 | Kaiser | German | emperor; variant of Caesar. | M | |
| 919 | Karl | German | Variant of the Germanic form of Charles, meaning a man. | M | |
| 920 | Karla | German | Feminine form of Karl. | F | |