One of my little nephews couldn't pronounce Auntie Ali ... try as he might, it always came out as AllyLally! Somehow the name stuck and my fourteen nieces and nephews all call me that, even though the eldest is now 23!
LOL, my (now adult) brother is 5 years younger than me, when he was a child, he couldn't pronounce my name, which is Lindsey, so he called me Ingy. He still does sometimes LOL.