Cross reference
Joshua 15:49
49 And Dannah, and Kiriath-sannah (which is Debir);
Joshua 15:15
15 From there he went up against the people of Debir: (now the name of Debir before that was Kiriath-sepher.)
Judges 1:11
11 And from there he went up against the people of Debir. (Now the name of Debir in earlier times was Kiriath-sepher.)