חֲמֵ֣שֶׁת ׀ סַרְנֵ֣י פְלִשְׁתִּ֗ים וְכָל־הַֽכְּנַעֲנִי֙ וְהַצִּ֣ידֹנִ֔י וְהַ֣חִוִּ֔י יֹשֵׁ֖ב הַ֣ר הַלְּבָנ֑וֹן מֵהַר֙ בַּ֣עַל חֶרְמ֔וֹן עַ֖ד לְב֥וֹא חֲמָֽת׃
Rashi on Judges
Five Pelishtite sovereignties. These were the nations whom He permited to remain as a test.
Metzudat David on Judges
FIVE: Look back on the text before this where it says "and these are the nations... five...