crony
Crony (noun) means a person you know well and spend time with; a close friend.
Etymology
Coined between 1655 and 1665 from Ancient Greek χρόνιος (khrónios, "perennial, long-lasting"); see also chrono- ("time"). It began as Cambridge University slang in the sense "chum", meaning "friend of long standing", later gaining an illegal connotation. Early spellings included chrony, as in Samuel Pepys's 1665 diary, which supports the Greek origin.