N.P. MALONE sent this info to me on the MALONE GENFORUM....
O Maoileoin is the original name, it is Galic means "one who served St. John" The Malone name is very old they had their home at Ballynahown, which is a sleepy little town in the center of Ireland, not far from Clonmachnoise, one of the most holy sites. For over a l000 years the Malones where very important in Ireland, and after the religious wars the family split, and again in l845 the famine sent many all over the world where they have done very well. Just read the lists of war veterans, At the Alamo, Revolutionary War, Civil War, War II I, and not just inthe Americas, but Italy, and many other countries.
The first name of John, is common in the Malone family since the Galic meaning is followers of St. John. Also, Walter, since Walter Malone wrote one of the most famous poems of the old South. Molly is also common after the song, which came from old Ireland, but ironically the words are modern and from an English doctor. Malones are kinsmen of the O Connors and have a famous history in Ireland.
The name malene is Galic from O Maoileoin, meaning "followers of St. John" As you can see, Mellown is a misspelling of the original, not uncommon, since most Irish could not write and so relied on others to spell their name as in your case Mellown is a close phonetic. The name is very old, and the family crest is a rampant lion with three stars, the motto, fidelias ad unanaum faithful to death.