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by 16s 5588 days ago
The BSDs have always done this... if I recall correctly, em is an Intel based NIC.

NAME em - Intel PRO/1000 10/100/Gigabit Ethernet device

http://www.openbsd.org/cgi-bin/man.cgi?query=em&apropos=...

Edit: Reading more of that thread I may be off-base here, but naming a network interface em that's not powered by certain Intel chipsets will be very confusing to BSD users. Just my 2 cents.