If you are you are in the Uk then Celine as many people won’t of heard of the Greek Selene (which I personally prefer) but will have heard of Celine Dion or the brand - so your Celine shouldn’t have to often spell her name.
I do love Shakespearean Silvia but not sure it’s worth a lifetime of always having to spell it out (Sylvia really will be the go to for 99% here and she can’t even easily say “Silvia with an i” as that will just confuse so she’ll have to spell it everytime).