Without wanting to get the wrong emphasis, I do love [name_f]Elowyn[/name_f] & [name_f]Solveig[/name_f] together - [name_f]Solveig[/name_f] [name_f]Lilias[/name_f], [name_f]Solveig[/name_f] Rosevale* & [name_m]Kindred[/name_m] Solveig.** They sound so windswept and historical. 
With [name_f]Solveig[/name_f], I think you could just about use [name_f]Valley[/name_f] as well as [name_m]Sol[/name_m] for a nickname.
*or another [name_f]Rose[/name_f] name, just not sure about [name_f]Rosemary[/name_f] flow.
** just realised might sound like kind soul, which is lovely but perhaps too literal.
I like [name_f]Marigold[/name_f] too - makes it lean more storybook vintage (I love [name_f]Goldie[/name_f] & [name_f]Honey[/name_f] as nicknames). Speaking of, as a wildcard/ off cuff thought: [name_f]Xanthe[/name_f] [name_f]Clare[/name_f] could be delightful as a pairing - nn [name_f]Honey[/name_f] or [name_f]Goldie[/name_f] via meaning of [name_f]Xanthe[/name_f]. 