Am starting to think we will never ever find a name for DD...
Really want a strong, un-frilly name, so nothing ending in "ie" or "y".
Our last name begins "Mel..." so that rules out any first name ending in "...bel" such as Isobel. DH thinks it also rules out any first name ending in S or an S sound e.g. Iris, Alix, Grace, as he's worried about teasing / nickname "Smelly".
DH is half portuguese, so something that works in both languages, possibly even a portuguese first name, but don't want to condemn DD to lifetime of having to spell her name or mispronunciations.
My previous favourite, Eleanor, has just been used by a close family member, so that's out too.
Middle name will definitely be Margaret for family reasons, so that means no first names starting "Mar..." (e.g. Marianne) or probably anything starting with M as three initials the same seems too much.
Hasn't been the easiest pregnancy (high risk for Downs, full on SPD, waiting for test results for suspected pre-eclampsia) so now getting stupidly superstitious about lack of a names shortlist and desperate to have at least some contenders to make me believe DD will be real IYSWIM.
I do like all the examples mentioned here as ruled out - please do your work!