Danny Boy" was written by the English lawyer and lyricist Frederick Weatherly in 1910. Although the lyrics were originally written for a different tune, Weatherly's sister modified them to fit "Londonderry Air" in 1913 when Weatherly sent her a copy.
Ernestine Schumann-Heink made the first recording in 1915. Weatherly gave the song to the vocalist Elsie Griffin, who in turn made it one of the most popular songs in the new century.
Danny Boy" was intended as a message from a woman to a man, and Weatherly provided the alternative "Eily dear" for male singers in his 1918 authorised lyric.

1960-61 - Jim Reeves recorded it twice, A slow version for the Album Tall Tales and Short Tempers in 1960 and in 1961 he recorded a version that was released as a single. He always closed his shows with the song.

1976 - Elvis Presley recorded the song in 1976 during the Jungle Room Sessions at Graceland in Memphis, TN. The master take is available on From Elvis Presley Boulevard. Other takes are available on The Jungle Room Sessions and Platinum. The song was noted as one of his favourite songs and was played at his funeral. Elvis said it was his father Vernon's favourite song.
On a personal level, my uncle passed away on the 28th November 2009, and this was his favourite song, which i have sang in tribute to him. (less info)