there is no football clubs which are nicknamed partner sorry :(
Manchester United
Portishead united football club 12000 km2
My understanding is that some time in a clubs past they combined (or united) with another team and united was used in teams new name.
Manchester united
Southend on Sea
Manchester United and Liverpool are both football clubs in the UK. They are two of the most successful clubs in England and both claim the title of the Greatest English Football Club.
There are two clubs with that nickname: Newcastle Utd and Notts County.
Leicester Football Club are known as the Tigers. Unlike some other nicknames for rugby football clubs it is not a recent invention of marketing consultants, but is believed to derive from the Leicestershire Regiment who gained the Tiger nickname for their service in India.
sir alex Ferguson since1987
In the E.P.L it is NewCastle United, West Brom, Middllesbrough.
They didn't, it's the clubs nickname, much like other clubs like Cardiff are called 'The Bluebirds' etc.