I prefer
Erica. It seems light and summery but historically solid, by association with
Eric, and the heather association is nice. It doesn't feel as dated as
Linda as it's never been popular here - I've only ever met one, and I think she was from
Hong Kong.
Erika is fine too, but more Scandinavian and less heathery.
Add me to the list of people who'd rather see
Linden than
Linda. It seems faddish & dated, and I imagine a grumpy elderly secretary with a perm she's had since the 80s.