In Czech (but may be true for other Slavic languages, at least western ones): * Josef - male form * Josefa - female form * Josefka - diminutive female form

In Czech (but may be true for other Slavic languages, at least western ones): * Josef - male form * Josefa - female form * Josefka - diminutive female form so Iosevka to me looks like English spelling of Josefka If you're curious, male diminutive forms of Josef are: Josífek, Jožin, Jožka, Pepa, Pepík and about 100 others.