there's always a good reason behind the name of a samba school - usually they are chosen because something in them is found to be representative of the community it serves.

the mocidade unida da cidade de deus is surely an example of a congregation which found the necessity to change its designation so it could better serve such purpose.

in english its name would be translatable as 'united youth from the city of god', and it is located exactly in the homonym neighborhood, but such designation is a recent addition.