Hi Illumosa !!!
I came across this name for the first time in the last
Harry Potter book. I like this name!
I can see it on an under30 (since childhood until 20s) so it has a modern vibe, positive this time.
I imagine a weird and nerdy boy, a twin with Platinum hair and grey eyes or very pale light-blue ones. Or also albino.
The '
Lys' part reminds me 'lily' in French, kind of aristocratic / royal vibe (symbol of House of Bourbon) but also the fictional city of
Lys (A Song of Ice and Fire) where people is platinum-haired. And
Luna Lovegood appearence is similar.
I don't know why but
Lysander make me think of a boy who is a medium and can see ghosts or something else.
All these things are positive in my opinion...just quite weird.
Personal Name Lists
https://www.behindthename.com/pnl/125456