USB-C to FireWire 800 adapter doesn't exist, make our voices heard for one. - Gearspace.com
Firewire via Thunderbolt 3 (USB-C) support on MacBook? - Questions & Answers | PreSonus
Amazon.com: 4 Pieces Firewire IEEE 1394 6 Pin USB Adapter Female F to USB M Male Cable Converter Firewire 6 Pin to Male USB 2.0 Adapter for Printer, Digital Camera, Scanner, Hard Disk : Electronics
Amazon.com: CY IEEE 1394 6Pin Female to 1394b 9Pin Male Firewire 400 to 800 Cable 20cm : Electronics