Family name Monacillo (Monacillo 
) , in the world, is quite a rare cognomen. The family name Monacillo is habitual in South-eastern Asia, particularly Philippines, where it is a rare surname.
An, Iris, Weny, Maria, Marde, Mabel, Merle, Myrna, Susan, Allan, Algie, Alpio, Ariel, Arnel, Arnie, Chona, Cejay, Belen, Bobet, Piana, Ramie, Ramel, Eric, Elsa, Juan, Jouy, Fe, Rio, Leo, Luz, Jay, Joy, Wie, Megs, Amor, Aiza, Randy, Kamz, Reil, Rian, Rhea, Ryan, Gina, Leon, Lina, Liza, Jose, Joel, Raul, and Rosie