I don't think
Ghislaine is usable.
Even if it was, I find it unattractive, and the meaning is disconcerting - "hostage", or, according to some sources "sweet hostage", which is arguably worse (though I know mediaeval name elements didn't work like that). ZHEES comes out as "jizz" in English, which is hardly favorable, and GEE-LEHN is even uglier.
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080