Dark Elves
Hag Graef - Malus Darkblade
Karond Kar - Lokhir Fellheart (unless used for Black ark pirate faction)
Clar Karond - Venhill Chillblade (I was wrong before there is a named leader for this)
Change gender of Blood Hall Coven leader to female, unfortunately no name available for the three female leaders though.
Maybe make Ghrond leader female and change her name to Shakkara, the lord that would be removed from Karond Kar, she's a minor meme on reddit (Shakira) and female leader for Ghrond makes more sense.
Names of potential Black Ark Captain - Captain Randelle Doomwhisper (Female), Mortharor, Duriath Helbane

High Elves
Caledor - Prince Imrik
Yvresse - Eltharion
Nagarythe - Alith Anar
Potentially change leader of Avelorn to female as much of the Everqueens upper court is female.

Greenskins
Broken Nose - Boggrub Legbiter

Vampire Counts
The Silver Host - Neferata (sort of, it's her territority anyway)

Skaven
Clan Eshin - Deathmaster Snikch (probably too much work, but making him a custom assassin LL would be more lore friendly and awesome)
Clan Skryre - Ikit Claw
Clan Mordkin - Feskit

Lizardmen
Itza - Lord Xlotec (Slann)