In an article written on January 30, 2024,Vitalik Buterin mentioned and introduced a name for a dog meme token,

"Is 0x1b54....98c3 actually the address of the "Casinu Inu" ERC20 token?".

Effectively giving birth to Casinu Inu a meme coin with no intrinsic value.

For the very first time, Vitalik created a name for a dog meme token. He came up with the name himself because it didn't exist before he mentioned it.

Source : https://vitalik.eth.limo/general/2024/01/30/cryptoai.html