O termo "hive" é, na verdade, um pouco de piada originado na Microsoft:
Because one of the original developers of Windows NT hated bees. So the developer who was responsible for the registry snuck in as many bee references as he could. A registry file is called a "hive", and registry data are stored in "cells", which is what honeycombs are made of.
(Fonte: Por que um arquivo de registro é chamado de 'colmeia'? )