I don’t think it’s bad. I actually think it’s kind of cute that your mother, you, and your daughter will all have different “Mar” names. But if you really want something with no [name_f]Mar[/name_f], I can offer:
Other -o/-ow ending names:
[name_f]Harlow[/name_f], [name_f]Juno[/name_f], [name_f]Cleo[/name_f], [name_f]Halo[/name_f]
Other surnamey girl names:
[name_f]Harper[/name_f], [name_f]Blair[/name_f], [name_f]Emery[/name_f], [name_f]Haley[/name_f]
Some other names that Nameberry said were similar to [name_m]Marlow[/name_m]:
[name_f]Waverly[/name_f], [name_f]Brynn[/name_f], [name_f]Carys[/name_f], [name_f]Sylvie[/name_f]
Names listed as being similar to [name_f]Willa[/name_f]:
[name_f]Hazel[/name_f], [name_f]Eloise[/name_f], [name_f]Flora[/name_f], [name_f]Alice[/name_f]