[whoopdedo]

Part of it may be where the passwords are scraped from. If "dragon" has some relevance to the field then there's a higher probability that it will be used by people working in that field. This list is a sample of passwords from compromised databases not from all databases in the world.

I wonder about the prevalence of "allsop" as a password. I came across it in a computer I was repairing last week and it shows up 159 times in this list. Is it from the acronym SOP? Or because of the company that makes mouse pads?

[userbinator]

My first thought was that there could be some connection with MMORPGs, which often feature dragons.

Or because of the company that makes mouse pads?

This is probably the case for "allsop" - there are people who will look around them for inspiration when coming up with a password, and what was written on their mousepad caught their attention.