Durgham is variant of Zargham and has the exact same meaning and pronunciation (see below for full meaning). You can use either Dergham or Zargham, both are correct and acceptable. If you like this variant more and you'd like to pronounce it the way it is spelled (different than the original name), this is perfectly acceptable. For more details please see the main entry at: Zargham

Arabic for “lion”, “brave warrior”. Can be pronounced with a long or short second “a” sound. (Zarghum or Zarghaam).

https://quranicnames.com/dergham/