Zamenhof is a display sans font family. This typeface has five styles and was published by CastleType.
Zamenhof is a family of five fonts that can be used singly or in combination to create a variety of bold, yet elegant, display styles. Inspired by Russian hand-lettering that appears to have been based on Jakob Erbar’s Phosphor, Zamenhof is essentially a Latin interpretation (with Cyrillic and Greek) of a Cyrillic interpretation of a Latin type design, with many changes along the way. (For example, all the Latin-only letters are quite different between the two designs: D, F, G, J, K, N, Q, R, S, U, V, W, Y, Z.)
The Inline and Inverse styles of Zamenhof are the basic fonts and can be used effectively on their own. The Plain and Outline fonts — which I recommend using only in combination with the main designs — were created specifically to be combined with Inline and Inverse, as underlay and overlay layers, respectively. (You will need an application that supports layers, such as Adobe InDesign or Photoshop.)
Zamenhof supports most European languages as well as modern Greek, and of course, Russian and other languages that use the Cyrillic alphabet. Needless to say, as Zamenhof is named after the father of Esperanto, it also supports Esperanto (as do all fonts from CastleType).