According to Allmusic.com, on the CD "The Slightly Fabulous Limeliters/Sing Out!" (that's two original LPs reissued as one CD) the song title is given as CURIMA and the songwriter as "Dorival Caymi" (which is eviently a misspelling of Dorival Caymmi).

However, on the album "Joy across the Land" by Glenn Yarbrough & The Limeliters, the song is called CURIMAO.

In both cases there are no diacritical marks.

I'm pretty sure Allmusic.com gets its information digitally from the record publishers, and therefore they usually accurately report whatever was printed on the record label, but record publishers are notoriously bad spellers.