Installed wireguard-tools. This is what I get from sudo wg-quick up manjaro (manjaro is my client config name):
sudo wg-quick up manjaro
[#] ip link add manjaro type wireguard
Error: Unknown device type.
Unable to access interface: Protocol not supported
[#] ip link delete dev manjaro
Cannot find device "manjaro"
This is what I get from sudo modprobe wiregaurd:
modprobe: FATAL: Module wiregaurd not found in directory /lib/modules/5.4.141-1-MANJARO