Chelsea is not a nickname, but a Cantonese transliteration. For example, Arsenal's Cantonese transliteration is Arsenal, Everton's Cantonese transliteration is Everton and so on. In fact, English clubs basically have nicknames or nicknames. Take the top 20 this season as an example:

Manchester United: The Red Devils. Liverpool: The Red Army. Huddersfield: Terrier. Manchester City: Citizens, sky blue. West Brown: Bloomers, blackbirds. Chelsea: Blue Army, veteran. Waterford: Bumblebee. Southampton: St. Hotspur: Hotspur. (We usually call this team Tottenham Hotspur, in fact Tottenham Hotspur is a nickname) Burnley: Purple Red Army. Stoke City: Porter, the city of the sky. Everton: Toffee. Swansea: Swan. Newcastle United: Magpie. Leicester city: Fox. Arsenal: Arsenal, the gunman. Brighton: Seagull. Bournemouth: Cherry. Crystal Palace: Eagle. West Ham United: Blacksmith, Hammer

Other famous English clubs that are not in the top league this season, such as Charlton: Brave, Shark. Fulham: Farmers, farmers. Aston Villa: Villa people. Sunderland: Black cat. Norwich: Canary. Derbyshire: Ram. Leeds United: Young Guards, White Corps.