Just looked on google it says this.
By all accounts, our own 'Wise Men Say' was first sung in the 1970's. Some say it was after Elvis died and others say it was specifically after a Hull game, but it was certainly in the 1970's and I wonder whether one of our own historians can provide a more accurate date and reason.5 Mar 2025.
Also says this
Hull City supporters began singing "Wise Men Say" around 2002, after they moved to their new ground, the MKM Stadium.The song, originally sung by Sunderland fans and based on Elvis Presley's "Can't Help Falling in Love", was adopted by Hull City.
And this also
Hull City supporters, along with fans of several other English football clubs, previously sang Elvis Presley's "Can't Help Falling in Love" before the "Wise Men Say" lyrics became popular. This song was a popular anthem in the 1960s and 1970s, particularly among fans who were known for their enthusiastic singing,
according to the Crystal Palace F.C.. The "Wise Men Say" lyrics are a variation of the original song's first line, often used as a chant during football matches,
according to Crystal Palace F.C..
Also found this list
From sources across the web
We ARE HULL
Hull City FC
Hull Flag
Come on City
Der Der City!
Falling in love with you
The Tigers
This Is The Best Trip
We love you City
Que Sera Sera
Wembley