Aristarchus

Boyd’s Bible Dictionary:

(best ruler). A Thessalonian companion of Paul on his third missionary tour (Acts 19:29; 20:4; 27:2; Col. 4:10; Philem. 24).

Concise Bible Dictionary:

A Macedonian of Thessalonica, companion of Paul on several journeys and on his way to Rome. Paul once calls him “my fellowprisoner” (Acts 19:29; Acts 20:4; Acts 27:2; Col. 4:10; Philem. 1:24).

Strong’s Dictionary of Greek Words:

Greek:
Ἀρίσταρχος
Transliteration:
Aristarchos
Phonic:
ar-is’-tar-khos
Meaning:
from the same as 712 and 757; best ruling; Aristarchus, a Macedonian
KJV Usage:
Aristarchus

Jackson’s Dictionary of Scripture Proper Names:

best ruler

Potts’ Bible Proper Names:

Ruling best; excellent ruler:―a Thessalonian, Acts 19:29. {Optime imperans}