In The Netherlands people tend to do the same with products based on Nijntje (known as Miffy internationally).
"Nijn" is the second syllable of "Konijn" (Rabbit) with "tje" being the diminutive.
So her name is an affectionate kid version of "Little Rabbit".
I have know idea where "Miffy" came from.
(and for dutchies, it's a long way until 11 november, but here's an early reminder for the times of covid: https://www.youtube.com/watch?v=ZRkqkBjlmqw )