Use the Surface USB-C to Ethernet and USB 3.0 Adapter - Microsoft Support
Anker PowerExpand USB-C to Gigabit Ethernet Adapter - Anker US
Amazon.com: Cable Matters Plug & Play USB to Ethernet Adapter with PXE, MAC Address Clone Support (Ethernet to USB 2.0 Adapter, Ethernet Adapter for Laptop) Supporting 10/100 Mbps Ethernet Network Black : Electronics
Amazon.com: Cable Matters 4-in-1 USB Hub with Ethernet, Support Gigabit Ethernet (USB 3.0 Hub Ethernet, USB to Ethernet Adapter, Gigabit Ethernet USB Hub, USB Ethernet Hub) with 10/100/1000Mbps Network in Black :
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Amazon.com: USB C Ethernet Adapter with Break-Proof, Full Metal case (USB-C Male to RJ45 LAN Female, Stable Network/Internet connectivity for Notebook/MacBook/Tablet at 1Gbit/s, 4in Cable) by CableDirect : Electronics
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Ethernet Adapter mit Kabel für Stick (2. Generation), 4K Stick, Square, 8297 | eBay