I'm not really a fan of
Sheila, idk why. I don't consider any name an "Old lady name," personally. If you like it, you can use it. It isn't overly common atm, so it would be unique. I love a kind of similar sounding name,
Shayla.
"You're a firework. Show your obstacles your brightest colors."-Me
Rate my name lists too!
https://www.behindthename.com/pnl/197673