Cognomen Troil (Troil 
) , around the world, is a rare last name. The family name Troil is habitual in Finland, where it is quite a rare surname, Sweden, where it is a rare surname, and Argentina, where it is a very rare surname. In absolute terms, the name is most common in Finland, Sweden, and the United States. Much less frequently, Troil is the forename as well as the last name.
| lona von troil SE (b. 1753) |
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| lars david von troil SE (b. 1764) |
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| hjalmar fridolf samuel von troil |
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| walter werner axel von troil FI |
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