The order made sense before they added Jan and Feb to the start (did line up the seasons though). And changed Quintilis and Sextilis to honor Julius Ceasar and Augustus
Martius — in honor of Mars
Aprilis — in honor of Fortuna
Maius — in honor of Maia
Iunius — in honor of Juno
Quintilis — fifth month
Sextilis — sixth month
September — seventh month
October — eighth month
November — ninth month
December — 10th month
On a similar theme, the meanings of the days names, mostly from Norse or Roman gods.
Sunday - Literally Suns Day from a Roman feast day.
Monday - Moons day, to celebrate the moon goddess.
Tuesday - Named after the Norse god Tyr
Wednesday - Named after the Norse god Wodan (Odin)
Thursday - Named after the Norse god Thor.
Friday - Named after the Norse god Frigg.
Saturday - Named after the Roman god Saturn.
The origin and evolution of words is a fascinating subject!