From the website "https://www.hitc.com/en-gb/2019/09/16/seven-chocolate-bars-that-changed-their-names-marathon-snickers/" :

"The Daim chocolate bar has had a long and storied history since it was introduced by Swedish confectioners Marabou.

Originally, in Scadanvia that bar was known as Dajm while in the UK, it was a Dime bar.

However, to create a standardised brand, the bar was renamed Daim in 1990 but it took the UK until 2005 to ditch the Dime name."


Maybe 'Dime' was chosen to sound American, meaning a 10-cent bar.