I love
Mary, it's my moms name too and I would definitely consider using it to honor her.
How about:
Mary LarkMary Ophelia Mary Minerva Mary Colette Mary Astrid Mary Gwendolyn Mary NiamhMary Juliet Mary HelenaMary Gretchen Mary Dahlia
It sounds good with practically anything, honestly. Plus there are more traditional combos like
Mary Anne,
Mary Elizabeth and
Mary Alice, which I also love.