This kinda depends on your pronunciation. If you pronounce it RAY-den, then “Raid” isn’t really a great way to shorten it. If you pronounce it RYE-den, which is the actual pronunciation, you could potentially shorten it to Raid, pronounced like “ride.”
Famous people named Raiden:
The most notable is Raiden, a character from the video game Mortal Kombat, but he’s not real, soooo …
Raiden is a very video-gamey name, with characters by that name not only in Mortal Kombat, but in Metal Gear, Fatal Fury, and Okami as well.