Hello all, I live in Reavilleen townland, Co Cork, and would like to paint the Irish name on my kitchen wall. I wanted to see if I could get consensus on the correct place name before I committed to the paint. I appreciate your time in advance!
The two suggestions I see on Irish websites are
Ré Mhaoilín
or
Réidh mhillin

I tend to like the second one because we are on a hilltop and as I understand it the second one refers to that, but the "accepted" version is the first. Any opinions?
THANKS!

https://www.logainm.ie/en/9040 says Ré Mhaoilín is "validated".
Unfortunately, such decisions are not explained.

réidh is an old spelling, modern spelling is ré, there is no other difference
millín is a small eminence, knoll (from meall = globe, ball) https://www.teanglann.ie/en/fgb/mill%C3%ADn
maoilín is a (little) knoll, hillock, too. (from maoil = bald top, maol = bald) https://www.teanglann.ie/en/fgb/maoil

So, both names mean the same.

BTW: In any case, there should be an uppercase M and an accent on second i in Ré(idh) Mhillín

Personally, I would prefer Ré Mhillín, too.
(b/c I would expect an English version of Ré Mhaolín as Reaveeleen with two long ee sounds)

There are other versions with an "a" inbetween (Réidh a Mhillín), e.g. https://durrushistory.com/wp-content/uploads/2014/02/placenames-from-irish.pdf.
This should better be written with an apostrophe Réidh a’ Mhillín or Réidh an Mhillín (a’ < an = the). But I doubt the existence of the article an/a’ here.

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Thank you so much for the in depth explanation of what each section of the word means and why each usage differs. I appreciate your time and talents.
Many kind regards,
Lisa