"Mercher" reminds me of the French word "mercredi," which also means Wednseday.
Not coincidentally - they're both named after Mercury.
- dydd LLUN = LUNdi (moon; Latin: dies Lunae)
- dydd MAWRTH = MARdi (Mars; dies Martis)
- dydd MERCHER = MERCREdi (Mercury; dies Mercurii)
- dydd IAU = JEUdi (Jove, Jupiter; dies Iovis)
- dydd GWENER = VENDREdir (Venus; Latin genitive: Veneris; dies Veneris)
- dydd SADWRN = SAMEdi (Saturn; dies Saturni)
Only Sunday is not related, being "day of the Sun" (dies Solis, dydd Sul) in Welsh but "Lord's day" (dies Dominica, dimanche) in French.
I gave you a lingo because your explanation was awesome! I wish Duo Lingo would come out with Latin courses. Sign me up!
I wish it had a Latin course as well as that's the language I'd like to do next :)
I'll be making do with school textbooks.
Does the "r" at the end of "Mercher" really make a "d" sound, or is that just the audio?