Combine these names to honour a grandparent

Grandmothers: [name]Marguerite[/name] and [name]Mary[/name]
Grandfathers: Mostyn and [name]Frederick[/name]

Combine these names to create a girls name and a boys name.

[name]Maryna[/name] like [name]Marina[/name], Mardrick, Ricktyn, Margerique

[name]Marguerite[/name] and [name]Mary[/name]:
First of all I think the double barrels [name]Mary[/name] [name]Marguerite[/name] and [name]Mary[/name] [name]Margaret[/name] would be so cool. [name]Marie[/name] [name]Margaret[/name] would flip which name was French : D. Or even just [name]Marie[/name].

[name]Mary[/name] [name]Pearl[/name] would capture the meaning of [name]Mary[/name] [name]Marguerite[/name].

[name]Mae[/name]/[name]May[/name] is historically a nickname for [name]Mary[/name] and [name]Margaret[/name]. Ditto [name]Maisie[/name], I think.

[name]Marit[/name] might be another option - Scandi form of [name]Margaret[/name] that ends in t like [name]Marguerite[/name], but looks more like [name]Mary[/name] in length.

[name]Margery[/name] / [name]Marjorie[/name] also comes to mind.

[name]Miriam[/name] is a form of [name]Mary[/name] that has two M’s, one for each name.

[name]Daisy[/name] was a historic nn for [name]Margaret[/name] and ends in y like [name]Mary[/name].

Mostyn and [name]Frederick[/name]:

[name]Foster[/name]
Morrick
[name]Forrest[/name]

Also [name]Frostine[/name] for a girl.

Martyn / [name]Martin[/name] = [name]Marguerite[/name]/[name]Mary[/name] + Mostyn
Marrick - [name]Marguerite[/name]/[name]Mary[/name] + [name]Frederick[/name]
Terrick - [name]Marguerite[/name] + [name]Frederick[/name]

[name]Frederique[/name] = resembles [name]Marguerite[/name] and [name]Frederick[/name]

[name]Marguerite[/name], [name]Mary[/name]
Mostyn, [name]Frederick[/name]