The problem with Nunu's perception of Lissandra.

Alright, my beautiful boardmates, here I come with another lore problem I found during listening to new Nunu's voicelines. As we know, in ancient ages, there were three most influential people in the Freljord, one of them was known as Lissandra. As we know this name is ancient, and its original owner decided to disguise under other people identities (no information of her being known as Lissandra), in the meantime creating a myth of The Ice Witch. She is just the Ice Dervish of unknown name, a noble from the Frostguard. Then, again, Nunu knows for some reason that The Ice Dervish (aka Lissandra) is the Ice Witch. It seems understandable, mostly because he must have had many adventures with Willump, yet, there, again, is a quote, when he called Lissandra his boss. And this strongly implies that they still see her as a righteous ruler, not a tyrant.

summary and conclusion:

Why do Nunu calls the Ice Dervish by the name of Lissandra? Was she that dumb to keep that name through all those fake identities? And the other thing, what's his perception of her, if he knows that the Ice Dervish is The Ice Witch, then why he still finds her a righteous ruler (he even says they should go back to "their" village, even though they were nomads adopted by the Frostguard)?

https://i.imgur.com/Vb08QEa.jpg

^The image of The Ice Dervish (Lissandra's fake identity), she clearly seems different than the Lissandra we know from the splash art.