Blood elves are High elves who changed their name in honour of the bloodshed of their fallen brethren, lead by Kael’Thas Sunstrider.
Void elves are a small group of Blood elves who were exiled from Silvermoon after engaging in experiments using the Void. So since Void elves are Blood elf exiles, they are by default also High elves.
Both ‘‘races’’ are High elves by means of origin.