Thinking of girls names that flow nicely with [name_f]Margaret[/name_f] as a middle name.
We have:
[name_f]Adeline[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Emily[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_u]Evelyn[/name_u] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Helena[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
Isobel Margaret Miller
Interested in your thoughts and any suggestions. 
I think [name_f]Emily[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m] is a tad too heavy on the Ms, but all of your other choices are great. I think I like [name_u]Evelyn[/name_u] best, but it might depend on how you intend to pronounce [name_f]Helena[/name_f].
I love [name_f]Helena[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m] with the [name_f]Helen[/name_f]-uh pronunciation. I also really like [name_f]Adeline[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m], and I would love [name_f]Isobel[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m] if it were spelled [name_f]Isabel[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m].
[name_f]Helen[/name_f]-uh
I thought that about [name_f]Emily[/name_f], but I have always loved the name so wanted it to work.
I like both spellings, [name_f]Isobel[/name_f] and [name_f]Isabel[/name_f].
[name_f]My[/name_f] favorites are [name_f]Adeline[/name_f] [name_f]Margaret[/name_f], [name_u]Evelyn[/name_u] [name_f]Margaret[/name_f], and [name_f]Isobel[/name_f] [name_f]Margaret[/name_f].
[name_f]Vivienne[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_u]Vivian[/name_u] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Anna[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Annabel[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Sophie[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Lilia[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Lilias[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Willa[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Audra[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Tessa[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Emma[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m] - lots of Ms but I am loving this combo.
[name_f]Elsie[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Alys[/name_f]/[name_f]Alice[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Edna[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
Some nice names there, I really like [name_f]Annabel[/name_f] but it’s taken. By someone we never see mind you.
I really like [name_u]Evelyn[/name_u] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]. I think it is by far the best combination of the ones you listed.
I also like:
[name_f]Lilian[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Adeline[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_u]Vivian[/name_u]/[name_f]Vivianne[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Annabelle[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Rosalie[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Emmeline[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Genevive[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
[name_f]Josephine[/name_f] [name_f]Margaret[/name_f] [name_m]Miller[/name_m]
Whew! I think after all that [name_u]Evelyn[/name_u] [name_f]Margaret[/name_f] [name_m]Miller[/name_m] is still my favorite combination.
[name_f]Lovely[/name_f] names! Esp. [name_f]Helena[/name_f]. I just cringe at [name_f]Margaret[/name_f]. Any chance of [name_f]Marguerite[/name_f]?
[name_f]Margaret[/name_f] is very special to us. I get that it’s not everyone’s cup of tea.
[name_u]Evelyn[/name_u] [name_f]Margaret[/name_f] seems to be the most popular. We love [name_f]Adeline[/name_f] and [name_f]Helena[/name_f].