Don't make fun of people's names, man. People don't usually choose their own names. If you're going to make fun of someone, make fun of something they choose to do, instead of the things they don't choose.
Is that making fun of his name? Or is it simply pointing out / wondering whether he a) chose a profession aligned with his given name, or b) chose a name aligned with his profession?
Lots of people have never heard of X for almost any value of X. Even if one had, it can be surprising to encounter an actual case of the thing in the wild.
The Grady Hill House? Why do you want to know about that, no one ever goes up there since the...incident. Say, you're not from around here are ya? Well, I'd stay far away from there.
Grady Hillhouse does seem like an ironic name for a civil engineer. As far as I can tell, that is indeed his real name. FWIW he uses this name on his LinkedIn profile as well: https://www.linkedin.com/in/gradyhillhouse
IMHO, Grady's YouTube channel is one of the best things on YouTube. He really is fantastic.
When I saw the title, I thought that Grady Hillhouse was a house that was in the news in the US that might have had a retaining wall collapse recently.
