allahumma ya muqallib al quloob. Neither the Quran nor the Hadith specifically names the phrase "Ya Muqallib Al-Quloob" as a dua (supplication). One meaning, however, is that it is a prayer to Allah to change people's minds. To put it another way, "Ya Muqallib Al-Quloob" means "O Turner of Hearts" in Arabic. ATcPY0.

doa allahumma ya muqallib al qulub