thee:
a word meaning 'you', used when talking to only one person who is the OBJECT of the verb.(we beseech thee,o lord.)

thy:
a word meaning 'your', used when talking to only one person.
(honour thy father and thy mother)

thou:
a word meaning 'you',used when talking to only one person who is the SUBJECT of the verb.(thou art indeed just,lord)

ye:
a word meaning 'you' , used when talking to more than one person.(gather ye rosebuds while ye may)

and also ye means 'the', used in the names of pubs,shops,ect. to make them seem old.(ye olde starre inn)