Names like Katja include alternative spellings such as Katya, longer forms like Katie, Katrina and Katerina, short forms like Kate, Kitty and Kit, and cross-language cognates including Catherine, Karen and Catrin.

Overall

1. Catherine (Katherine, Kathryn, Katharine, Catharine, Katheryn, Cathryn, Cathrine, Kathrine)
2. Karen (Karan, Kairon, Keren, Cairon, Caren, Karan, Charon, Karon)
3. Katie (Katy, Kati, Kaytee, Catie)
4. Catalina
5. Catrin
6. Catriona
7. Katerina (Katarina)
8. Kasia
9. Ekaterina
10. Katrine

Longer forms

• Katie, Katy, Kati, Kaytee, Catie
• Katrina
• Katerina, Katarina
• Katia
• Katya, Katja
• Ekaterina
• Katriana
• Katharina
• Katrine

Short forms

• Kate, Cate, Cait
• Kitty, Kittie, Kitti
• Kit, Kitt
• Kaysha, Kaisha, Catia
• Riina
• Kat
• Kaysa

Related short forms

• Kath
• Cattee
• Catlee
• Katiya

Cognates

Names with the same meaning but not necessarily in the same language or format

• Catherine, Katherine, Kathryn, Katharine, Catharine, Katheryn, Cathryn, Cathrine, Kathrine
• Karen, Karan, Kairon, Keren, Cairon, Caren, Charon, Karon
• Catrin
• Catalina
• Catriona
• Kasia
• Caterina
• Catarina
• Kateryna

Alliterative names

Names that start with similar sounds to katja

• Connor, Conner, Coner, Konnor, Connar
• Carl, Karl
• Carter, Karter
• Constance
• Carla, Karla
• Carlos
• Khalid
• Carmen
• Qasim
• Kaya

Other names that contain similar sounds

• Kaya, Kaya, Caia
• Tanya, Tania, Tonya
• Tahlia, Talya
• Kavya
• Ata

Names with similar tags

Tags include origins, well known people etc

• James
• Carin
• Elliott
• Erin
• Rory
• Ryan
• Ellis
• Amy
• Jetta
• Nefertiti

Names with similar locations

Compares geographical origins and national popularity

• Lis
• Norman
• Elaine
• Else
• Sibylla
• Lea
• Berta
• Taras
• Irma
• Henriette

Names popular in similar years

Looks for trends from data about name popularity across the decades

• Michael
• Samuel
• Thomas
• Benjamin
• Joseph
• Elizabeth
• Charles
• Daniel
• James
• Jacob