Okay, I'll give you a meaning for a FN and MN for each family member and you find a name that has the same meaning or a meaning that is close. (example of what I mean by close - if I say the meaning "fire" and you don't like any of those you can use the word "red" and chose a name from those.)
Have fun and be creative!
DH:
FN: deer
MN: hunter
DW:
FN: love
MN: music, dance, art
DS:
FN: first, only
MN: son, child
DD:
FN: protected, loved, guarded, beloved
MN: daughter, child
DD:
FN: angel, spirit, soul
MN: peace, mercy, faith, hope
DS:
FN: helper, savior, protector, keeper
MN: water, snow, wind, fire, earth