By the time the calendar was being used across the Hellenistic world, seven total embolimoi (intercalary months) were being added in each 19 year Metonic cycle.
[1] Most of them combine a Macedonian dialectal form with a clear Greek etymology (e.g Δῐός from Zeus; Περίτιος from Heracles Peritas ("Guardian") ; Ξανδικός / Ξανθικός from Xanthos, "the blond" (probably a reference to Heracles); Άρτεμίσιος from Artemis etc.)
An example of 6th century CE inscriptions from Decapolis, Jordan, bearing the Solar Macedonian calendar, starts from the month Audynaeus.
The Roman one is attested in inscriptions with the name Kalandôn gen. καλανδῶν calendae and the Macedonian Hellenikei dat.
This practice spread outside the Seleucid Empire and found use in Antigonid Macedonia, Ptolemaic Egypt, and other major Hellenistic states descended from Alexander's conquests as well.