Vlad
Moderator
I just read an interesting little blurb on the internet and apparently RJ45 has been obsolete for quite a long time and was only used in Telephony applications. The Ethernet plug is an 8P8C modular plug. Back when true RJ45 was in use and 8P8C started being used, people just recognized the shape and hole as smiler to RJ45 and just called it that.
http://en.wikipedia.org/wiki/8P8C
http://en.wikipedia.org/wiki/8P8C