You and I, as adults, know to call things by their actual names. My kid is 4, and does no such thing.
Which is why, despite now being a 4 year-old kid who can actually do a fairly good job of speaking like a human being, he persists with his cute lil' baby names for the systems and games he was familiar with back then.
They have stuck, and I just don't have the heart to correct him, because there is nothing better in the world than hearing somebody be convinced a game is actually called "Mario Build It".
Nvidia Shield: "Da Shee-uwd"
iPad: "AH [long pause] pad"
Xbox One: "Exx [long pause] Box"
PS2: "Old Pwaystation"
PS4: "Daddy's Pwaystation"
PlayStation Vita: "Little Pwaystation Beetah"
Sega Dreamcast: [puzzled silence]
Nintendo GameCube: "Old Nintendo"
Nintendo GameCube Bongo Drums: "Donkey Kongs"
Nintendo 2DS: "Little Nintendo"
Nintendo 3DS: "Daddy's Big Little Nintendo"
Nintendo Wii U: "Big Nintendo"
Nintendo Switch: "Zelda"
Mario Kart 8: "Mar-YO Kart"
Super Mario 3d World: "The Mar-YO game"
Super Mario Maker: "Mar-YO Build It"
Yoshi's Wooly World: "Yoshi's Wooly Wooly World"
Street Fighter II: "Street Fighters [punches air]"
Disney Infinity: "Fin Finny"
Super Mario Odyssey: “Mar-YO’s Super Odyssey”
Mario + Rabbids Kingdom Battle: “Mario Wabbids Gun Game”
UPDATE: Nov 2018 (He’s five now):
Super Smash Bros. Ultimate: “Mar-YO Smash Bwuvvers”