I like it. I know a
Helga - she is blonde, but she's a super-hip techie type and carries the name off well.
Helga Miriam and
Helga Ruby grab me most from your list - I'm not usually that fond of
Ruby, but it really seems to go.
More combos:
Helga JuliaHelga BeateHelga KarinHelga AlenaHelga Wiebke