Eumenes II named the city for the love of his brother, who would be his successor, Attalus II (159–138 BC), whose loyalty earned him the nickname, "Philadelphos", literally meaning "one who loves his brother".
Eumenes II menamai kota ini karena kasihnya pada saudara laki-lakinya, yang kelak menggantikannya, Attalus II (159-138 SM), yang kesetiaannya menyebabkan Ia diberi julukan, "Philadelphos", arti harafiahnya "orang yang mengasihi saudara laki-lakinya".