For me,
Nell has warmth and charm and also feels grounded; definitely like it. Visually, I slightly prefer the spelling,
Nelle. I played around with combos some time back and my favorites then (using your spelling) were...
Nell HermioneNell Winifred
Other ideas (please forgive any repeats)...
Nell AbigailNell BridgetNell CatrinNell CordeliaNell DanicaNell EugenieNell FionaNell GenevieveNell HenriettaNell IoneNell JuliaNell JuniperNell KerensaNell MarianneNell RosannaNell RosemaryNell SamanthaNell SusannahNell TamsinNell TheodoraNell Tuesday
Nell Vivienne