[Kwpolska]

> If it's just a monolingual app. Sure go nuts, make it read super fluidly.

The Polish IM app Gadu-Gadu was monolingual. The user's gender was part of the user profile. Now, virtually all female Polish names end in -a (foreign names aside, there's maybe one or two exceptions). There's a fairly popular male name (Kuba) that ends with -a, and GG did use the feminine verb when showing the notification that he's online.

It's usually a diminutive form, but some people have this as their official name, and people are likely to use a diminutive form in your contacts list.