Name means “tumble”

close with Zebulunites

the 6th son of Jacob, and Bilhah's youngest of two: "Rachel said, 'With mighty נַפְתּוּלִים (nap̄tûlîm, H5319) I have פָּתַל (pāṯal, H6617) with my sister, and have prevailed'; so she named him נַפְתָּלִי (nap̄tālî, H5321)." (Genesis 30.8)

see also נָפַל nāp̄al (G5307) v. to fall, tumble.