my white muslim sis in law and bro have named their son Ryan .. english spelling of Rayyan

i know this is her doing

i am furious as its not a pakistani name and doesnt sound muslim

for 4 months ive refused to use his name as do most of the family but she still doesnt budge

she claims Allah swt created all in east and west and his name is fine

what should i do continue to try make her give him a proper muslim name or just accept it ?

shes now saying she doesnt want me to see if im going to call him boy