In Ukrainian dialects, “boy” also goes by other names: хлопак (Dniester dialect).
German by region: Bub (Austria, Baden-Württemberg, Hesse, Rhineland-Palatinate, Saarland); Bua (Bavaria); Bueb (Switzerland).
In other languages: хлопчик (Ukrainian), Junge (German), garçon (French), niño (Spanish), chłopiec (Polish).