Personally, no, I wouldn't use either name for a child which is a great shame. It does make me sad as I'd love to honour my mum, I just can't really get excited about the name
Sarah (and trust me I've tried hard) and I don't like that
Jayne has a 'Y' in it, it just seems unnecessary.
If I could rename my mum I'd probably keep her initials S.J. and name her something like
Seren. It has that first initial, it sounds similar to
Sarah and it reflects her Welsh nationality. I'd keep
Jayne but drop the 'Y' to Jane...or perhaps swap it for
June.
Seren June