John Gill Commentary Judges 1:11

"And from thence he went against the inhabitants of Debir. (Now the name of Debir beforetime was Kiriath-sepher.)" — Judges 1:11 (ASV)

And from thence he went against the inhabitants of Debir: and
the name of Debir before [was] Kirjathsepher .
] (See Gill on Joshua 15:15).