Why are 64-bit distros often called 'amd64'?
Because AMD was the first one to release 64-bit x86 (x86-64) CPUs.
the AMD64 architecture was positioned by AMD from the beginning as an evolutionary way to add 64-bit computing capabilities to the existing x86 architecture, as opposed to Intel's approach of creating an entirely new 64-bit architecture with IA-64.
The first AMD64-based processor, the Opteron, was released in April 2003.
In fact, in the kernel the 64-bit support is called 'x86_64' to refer to the fact that both AMD and Intel (and others) implement those instructions.
AMD intially implemented x86-64, before Intel. For this reason, most distros (and other OSs such as OpenBSD) did a first release when it was still AMD only, or renaming to x86-64 wasn't considered worth the effort.
I think one of the another contributing factors to this naming confusion was a conflict between Intel and AMD over naming. Intel had an identity crisis in it's 64-bit naming. It cycled through the names EM64T, IA-32e, and finally the official Intel 64. AMD on the other hand always called it AMD64. x86-64 was a fairly obvious name to cover both. However, it wasn't always like this. I remember when it was new and shiny people couldn't figure out what to call it. I've seen these:
- x64 -- ambiguous between Itanium and x86-64
- IA64 -- again, ambiguous with Itanium
- amd64 -- what you see now
- EM64T -- rare, but I've seen it before used to refer to both AMD and Intel
x86-64 is the obvious best short name for the architecture