Minnie

Eve swore Minnie to secrecy in hopes that she wouldn't tattle about what they'd done.

Source: tatoeba (9501228)

When they are used to express the affectionate regard of near friends and relatives they also may be pretty and appropriate, but they look very silly in a formal signature, and surely do not befit the dignity of womanhood. We had, for instance, among these 800 names scores of Minnies, Mamies, and only here and there a Mary, a much more euphonious as well as a dignified name.

Source: wiktionary

In quiet, sheltered places, where the water is clear but does not run too swiftly, the ‘minnie,’ as the stickleback is locally called, makes its nest by the bank. […] On these fibres the ova are deposited, and they are then either purposely partly covered with sand by the minnie, or else the particles that are brought down by the current gather over the bundle of fibres and conceal it, excepting one small spot.

Source: wiktionary