וְאֶת־הָֽאַרְוָדִ֥י וְאֶת־הַצְּמָרִ֖י וְאֶת־הַֽחֲמָתִ֑י וְאַחַ֣ר נָפֹ֔צוּ מִשְׁפְּח֖וֹת הַֽכְּנַעֲנִֽי׃
און דעם אַרוָדי, און דעם צמָרי, און דעם חַמָתי; און דערנאָך האָבן זיך צעשפּרײט די משפּחות פֿון דעם כּנַעֲני.
Rashi
ואחר נפוצו AND AFTERWARDS WERE SPREAD ABROAD — From these many families were spread abroad (besides those already mentioned. 5:15—18).
Siftei Chakhamim
Many families. ואחר נפצו cannot refer to the above-mentioned descendants of Canaan, [saying that they spread across the earth,] for then it should say just ואחר נפצו and omit משפחות הכנעני. For it clearly would refer back to those above. Perforce, it says משפחות הכנעני to tell us that “from these, many other families branched out.” This is similar to Noach’s three sons [from whom many families branched out]. (Re’m)