Surname is a colour so quite short.
Thinking woodland, nature, etc but Willow and Rowan feel too used may be.
Sylvie I like but quite girly
Robyn - so fits in with local tradition of naming daughter with same initial as father. Also happens to be first part grandmother’s maiden name plus appropriate for time of year.
Elowen - I love this on paper, looks good with surname but I’m just not too sure I like the actual proper Cornish pronunciation which is Elooen or El-Oh-wen as opposed to nicer sounding American EL-i-win (my best attempt at being phonetic) 😳