This has strangely been bugging me all morning. Not the names, which I admit are just totally not my taste (don't like surname names that much on boys, let alone on girls, I really thought that somehow you put up your boy names) but the fact that you and your husband don't both like the names. I really would go back to the drawing board and find ones you both like rather than just picking one and having the other person not like it.
Are Kennedy and Emerson both girls? (Gage too?) I think you can find some other similar names that you would both like I think. Many people like these kind of names and so there are a lot around, would be happy to offer suggestions, and maybe something that sort of fits your family through a family name or meaning?
Some other that are used on girls sometimes:
Delaney
Waverly
Lindsay
Avery
Arden
Linden (also a really pretty tree)
Ashton
Fallon
Peyton
Quinlan
Ridley
Taylor
Forgive me if you really don't want suggestions, it just seemed so divisive having only one parent like the name.
(and you know I had to feel strongly about it to give suggestions of surnames for girls, are you sure we couldn't interest you in a nice Theodora or Genevieve or Aliza?
)