It's always been one of my favorite names, but I do think it's dated.
Even if a name is classic and/or Biblical,
Rebecca being both, I still think it can be dated if it had a rise and then a fall in popularity in the past. In fact, its popularity at the time was one reason I rejected it when I had my daughter---I wanted to avoid a name that would one day be dated.
I prefer the tried and true
Rebecca spelling.