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Dudine is the feminine for Dude. The female version of dude is often said to be dudette and often used as so. Merriam-Webster has the real answer, though. The dictionary says that the female version of a dude is actually a dudine. Dude is used as slang, and dudette is known and used in a slang manner, too.
Mina/Meena is a bit more elegant than Minnie, but it is very similar sounding to your older dd. Here's a similar list for girls names with 'man' in them, Amanda being the most obvious. Marnie is a name in it's own right, the root is Marina, but that is way too similar to Malina!