The name Ein Shemer has five origins:
Because the founders of the kibbutz originally belonged to a gar’in group named Ein Ganim
Because of their aspiration to find a spring of water [ma’ayan – ayin – ein] on the land – which eventually came to pass!
Because members of HaShomer group set up a guard post on the spot
Because the kibbutz founders belonged to HaShomer HaTzair youth group
Because the kibbutz is situated within the area of the Biblical kingdom of Shemer, king of the Shomron.