There were several ranks which had Marshal in them:

• Air Marshal a rank in the Imperial Navy
• Air Marshal of the Republic an honorary title during the Galactic Republic
• Alliance Marshal were Galactic Alliance law enforcement officers that answered to the Office of the Chief of State
• Clone marshal commander a high ranking Clone trooper commander in the Grand Army of the Republic
• Field Marshal a rank used by the Mandalorian Neo-Crusaders
• High Marshal a rank used by the Iron Knights during the Clone Wars
• Surface Marshal a rank in the Imperial Army

Additionally, you may be looking for real-world people:

• Marshall Andrews III an illustrator and artist
• Vanessa Marshall a voice actor from Star Wars: Jedi Knight II: Jedi Outcast and Star Wars: Knights of the Old Republic II: The Sith Lords

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