Quick answer
Philadelphia is a girl name.
Meaning and history
This name comes from the name of a city in Asia Minor mentioned in Revelation in the New Testament. The name of the city meant "brotherly love" from Greek φιλέω ( phileo ) meaning "to love" and ἀδελφός ( adelphos ) meaning "brother". It is also the name of a city in the United States.
Notes and context
Usage: english