Haider \ha(i)-der\ as a boy's name is a variant of Haidar (Arabic), and the meaning of Haider is "lion".

The baby name Haider sounds like Hadar, Heder, Hadur, Hyder and Haydar. Other similar baby names are Hadden, Haden, Hammer, Hayden, Heiner, Hideo, Jader, Havier, Nader, Rayder and Rider.