The word 'Calley' is a name; the appropriate pronoun, depending on context, would be I, me, you, he, him, she, or her. Examples:
Mr. Calley gave this to me, he is my math teacher.
Please tell Calley that there's a phone call for her.
William Calley is 5' 5".
Calley McGrane was born in 1989.
Henry Calley was born in 1914.
Henry Calley died in 1997.
William Calley goes by Rusty.
George Calley has written: 'Collessie'
William Calley was born on June 8, 1943.
William Calley was born on June 8, 1943.
Samuel Calley was born on 1821-04-13.
Samuel Calley died on 1883-01-01.
Thomas Charles Pleydell Calley died in 1932.
Thomas Charles Pleydell Calley was born in 1856.