Well, in English, not French, Laurence is the male version and Laura/Lauren the female version of the name; Laurent is not an English name.
I think Laurie is lovely and know 2 boys called this (though one is spelled Lawrie).
Silas is very Cold Comfort Farm - taciturn men glumly staring at the snood of porridge. Cclose to 'silage' and 'silo' and 'silt' and to me sounds like a cross between 'silent' and 'alas'.