Was it Julius July and Augustus August?
yes but its weird and complex: https://www.livescience.com/45650-calendar-history.html
The calendar year was 10 moons long, and the remaining (roughly 70) days of winter occurred without being assigned a month name. The beginning of the year (and the starting of the calendar) signaled that farmers should trellis vines, prune trees, and sow spring wheat. This was the time that workers could expect equal parts night and day. New Years was celebrated on the first new moon before the spring equinox.
713 B.C. calendar you can see names starting to line up with our names over 2,700 years later :
Martius (31 days)
Aprilis (29)
Maius (31)
Iunius (29)
Quintilis (31)
Sextilis (29)
Septembris (29)
Octobris (31)
Novembris (29)
Decembris (29)
Ianuarius (29) — in honor of Janus
Februarius (28, 23 and 24) — for the purification festival of Februa
Intercalaris (27) — Intercalary month [pads to 365 or so as needed]
(post is archived)