Maybe you could give your child the same initials, or use a name that has ‘mar’ in the first name, and ‘sha’ in the middle name? That way you could still use [name_f]Marjorie[/name_f], [name_f]Margaret[/name_f] or [name_f]Marta[/name_f] (e.g: [name_f]Mar[/name_f]ta Shalom or [name_f]Mar[/name_f]garet Sasha). [name_f]Matilda[/name_f], from your signature, also has a similar meaning, so that could work nicely too.
names with the same meaning / similar meaning: [name_f]Marcella[/name_f] / [name_f]Marcela[/name_f], [name_f]Malou[/name_f], [name_f]Matilda[/name_f], [name_f]Maude[/name_f], [name_f]Edith[/name_f], [name_u]Lou[/name_u], [name_f]Louisa[/name_f], [name_f]Louise[/name_f], [name_f]Edie[/name_f], [name_u]Sasha[/name_u], [name_f]Martine[/name_f], [name_f]Martina[/name_f], [name_f]Aloisia[/name_f], [name_f]Marciana[/name_f].
Similar sound (at least contains the ‘mar’ part): [name_u]Marley[/name_u] (for [name_u]Lee[/name_u] as well?), [name_f]Mara[/name_f], [name_f]Marigold[/name_f] (ties in the nature theme of [name_u]Lee[/name_u] too?), [name_f]Marina[/name_f], [name_f]Marilee[/name_f] (adds the ‘lee’ part too), [name_f]Mariel[/name_f], [name_f]Marisa[/name_f], [name_f]Maris[/name_f], [name_f]Marisol[/name_f], [name_f]Mariska[/name_f], [name_f]Marini[/name_f], [name_f]Mary[/name_f], [name_f]Marta[/name_f], [name_f]Martha[/name_f], [name_f]Marie[/name_f], [name_f]Maria[/name_f], [name_f]Mariana[/name_f], [name_f]Marianna[/name_f], [name_f]Marianne[/name_f], [name_f]Marietta[/name_f], [name_u]Marian[/name_u] / [name_u]Marion[/name_u], [name_f]Maribel[/name_f], [name_f]Margo[/name_f], [name_f]Marit[/name_f], [name_f]Marielle[/name_f], [name_f]Mariella[/name_f], [name_f]Marcina[/name_f], [name_f]Margalo[/name_f].
[name_f]Rosemary[/name_f], [name_f]Amara[/name_f], [name_u]Amari[/name_u], [name_f]Amaryllis[/name_f], [name_f]Annamarie[/name_f], [name_u]Damaris[/name_u], [name_f]Samara[/name_f], [name_f]Tamara[/name_f], [name_f]Tamar[/name_f], [name_f]Samari[/name_f], Primarose, [name_f]Primarosa[/name_f].
Names with ‘sha’ in them: [name_u]Shalom[/name_u], [name_f]Farasha[/name_f], [name_f]Parasha[/name_f], [name_f]Porsha[/name_f], [name_f]Natasha[/name_f], [name_u]Shay[/name_u], [name_f]Asha[/name_f], [name_f]Ashanti[/name_f], [name_u]Sasha[/name_u] (has similar meaning to [name_f]Marsha[/name_f] too), [name_f]Adasha[/name_f], [name_f]Dasha[/name_f], [name_u]Misha[/name_u], [name_f]Aisha[/name_f], [name_f]Dosha[/name_f], [name_u]Elisha[/name_u] (technically a boys name, I don’t know whether that would bother you or not), etc.
[name_u]Lee[/name_u] (similar meaning): [name_u]Marley[/name_u], [name_u]Abilene[/name_u], [name_f]Meadow[/name_f], [name_u]Prairie[/name_u], [name_f]Hallie[/name_f], [name_u]Waverly[/name_u], [name_u]Ohara[/name_u], [name_f]Ardith[/name_f], [name_f]Nira[/name_f], [name_f]Orino[/name_f].