Legion

Acts 10:1 There was a certain man in Caesarea called Cornelius, a centurion of the band called the Italian band, [kjv]

ανηρ δε τις εν καισαρια ονοματι κορνηλιος εκατονταρχης εκ σπειρης της καλουμενης ιταλικης [gnt]

… cohortis … Italica [v]

In Roman times, a legion was a group of soldiers gathered or collected together for the purpose of military actions. Legions were numbered but many legions had names, some of which appear in the GNT (Greek New Testament).

The word "legion" cames from the Latin which comes from the Greek.

The Latin word "legion" was a name for a unit of soldiers, which could vary but had about 1,000 soldiers in it, more or less, usually less over time, as has happened though out history.

Here the "band" is a "cohort", part of a Roman "legion".

Acts 10:1 There was a certain man in Caesarea called Cornelius, a centurion of the band called the Italian band, [kjv]

ανηρ δε τις εν καισαρια ονοματι κορνηλιος εκατονταρχης εκ σπειρης της καλουμενης ιταλικης [gnt]

… cohortis … Italica [v]

Acts 10:1

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KJV: There was a certain man in Caesarea called Cornelius, a centurion of the band called the Italian band,

Greek: ανηρ δε τις ην εν καισαρεια καισαρια ονοματι κορνηλιος εκατονταρχης εκ σπειρης της καλουμενης ιταλικης

Latin: vir autem quidam erat in Caesarea nomine Cornelius centurio cohortis quae dicitur Italica

Acts 27:1 And when it was determined that we should sail into Italy, they delivered Paul and certain other prisoners unto one named Julius, a centurion of Augustus' band. [kjv]

ως δε εκριθη του αποπλειν ημας εις την ιταλιαν παρεδιδουν τον τε παυλον και τινας ετερους δεσμωτας εκατονταρχη ονοματι ιουλιω σπειρης σεβαστης [gnt]

… cohortis Augustae [v]

… knyytis … emperoure. [wy]

… Cesars soudiars. [ty]

… kaiserlichen Schar. [lu]

The Middle English word "knyytis" ≈ "soldier" as in "knight".
The Middle English word "soudiars" ≈ "soldier" from the French word "soldat" ≈ "soldier".
The Latin word "cohortis" ≈ "cohort", somewhat like a company today.

Acts 27:1

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KJV: And when it was determined that we should sail into Italy, they delivered Paul and certain other prisoners unto one named Julius, a centurion of Augustus' band.

Greek: ως δε εκριθη του αποπλειν ημας εις την ιταλιαν παρεδιδουν τον τε παυλον και τινας ετερους δεσμωτας εκατονταρχη ονοματι ιουλιω σπειρης σεβαστης

Latin: ut autem iudicatum est eum navigare in Italiam et tradi Paulum cum reliquis custodiis centurioni nomine Iulio cohortis Augustae

Wycliffe: But as it was demed hym to schippe into Ytalie, thei bitoken Poul with othere kepers to a centurien, bi name Julius, of the cumpeny of knyytis of the emperoure.

Tyndale: When it was cocluded that we shuld sayle into Italy they delivered Paul and certayne other presoners vnto one named Iulius an vnder captayne of Cesars soudiars.

Luther: Da es aber beschlossen war, daß wir nach Welschland schiffen sollten, übergaben sie Paulus und etliche andere Gefangene dem Unterhauptmann mit Namen Julius von der kaiserlichen Schar.

Note: The books of Luke and the Acts (both written by Luke) are often taken to be a collection of writings that were to be presented at Paul's trial before Caesar, as required by Roman law. In Luke and Acts, the Romans, such as Centurions being presented in a favorable light and insurrections presented in an unfavorable light, etc.

Mark 5:9 And he asked him, What is thy name? And he answered, saying, My name is Legion: for we are many. [kjv]

και επηρωτα αυτον τι ονομα σοι και λεγει αυτω λεγιων ονομα μοι οτι πολλοι εσμεν [gnt]

The Greek word «λεγιών» just mean a lot of gathered entities, as in the following verse.

Mark 5:9

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KJV: And he asked him, What is thy name? And he answered, saying, My name is Legion: for we are many.

Greek: και επηρωτα αυτον τι σοι ονομα σοι και απεκριθη λεγων λεγεων λεγει αυτω λεγιων ονομα μοι οτι πολλοι εσμεν

Mark 5:9 And he asked him, What is thy name? And he answered, saying, My name is Legion: for we are many. [kjv]

και επηρωτα αυτον τι ονομα σοι και λεγει αυτω λεγιων ονομα μοι οτι πολλοι εσμεν [gnt]

The modern Greek word "λέγω" (LEH-go) ≈ "gather, say" is related to the modern Greek word "λέγιον" (LEH-y-on) ≈ "legion".

Gathering and collecting words to say.
Gathering and collecting soldiers for fighting.