jag (Romani) comes from Sauraseni Prakrit 𑀅𑀕𑁆𑀕𑀺, from Ashokan Prakrit ???, from Sanskrit अग्नि, from Proto-Indo-Aryan Hagníṣ, from Proto-Indo-Iranian Hagníš, from Proto-Indo-European h₁n̥gʷnis, from Proto-Indo-European h₁engʷ- — to burn; fire.
jag (Romani): fire