Let's have some FACTS!
Have you ever noticed why Barty Crouch was consistently calling Percy "Weatherby"?
The name "Weatherby" is used by Barty Crouch Sr. to refer to Percy Weasley, and it's not a term of endearment or a simple mistake. It's implied that Crouch Sr., due to his mental state, either doesn't know or doesn't care to learn Percy's actual name, potentially mistaking him for a former assistant named Weatherby. The name also subtly highlights Crouch's impersonal attitude and Percy's perceived insignificance to him. 
Here's a more detailed breakdown:
Crouch's Mental State:
Crouch Sr. is under the influence of the Imperius Curse and is living in the past, even having conversations with a non-existent Weatherby. 
Percy's Awe:
Percy, initially starstruck by Crouch, doesn't correct him, further solidifying the running gag. 
Symbolic Meaning:
The name "Weatherby" is a subtle way of showing Crouch's disregard for Percy and his lack of attention to detail. 
Name Similarity:
The name also bears a resemblance to "Weasley," which could be interpreted as a deliberate, albeit subconscious, act of misnaming by Crouch. 
Running Gag:
The use of "Weatherby" becomes a recurring joke throughout the book, highlighting Crouch's erratic behavior. 

~ Stay Tune 😉 ~