This card's effect of sending a "Zoodiac" monster from the Deck to the Graveyard is a reference to the Rat's role in The Great Race (an origin story of the Chinese zodiac), where it pushed the Cat into the water, causing it to drown.
"Marmorat" in this card's Japanese name, "Marmorat of the Twelve Zodiac Beasts" (じゅうにししモルモラット, Jūnishishi Morumoratto) appears to be a portmanteau of "morumotto" (the Japanese word for guinea pig) and "ratto" (the Japanese pronunciation for the English word "rat"), both of them based on rodents largely raised as experimental animals.
"Ratpier" in this card's English name is a portmanteau of "rapier" and "rat", which is reflected in this monster's appearance of a rat-themed knight who are known for wielding rapiers as weapons.
Also, this monster's weapon is a rapier that features rat-like figures on its hilt, which further reflects this card's English name.