When he returned to Dublin he dispatched Irish folklore experts to record the last native speakers of the Manx Gaelic language.
The recordings sparked renewed efforts to preserve the language.
This led to its revival from the 1950s onwards.
Gaeltacht Minister O Cuiv has been invited by the Isle of Man government to advise it on the introduction of a new Manx Language Act.
"Gaelic and Manx are actually very similar so it makes perfect sense to explore possibilities to share information and expertise with the goal of the preservation of both languages,'' Mr O Cuiv said.
"My grandfather actually conversed with some of the old speakers and they could understand each other very well.''
While on the island, Mr O Cuiv will visit an all-Manx Bunscoill Gaelgagh and tour some of the remote Manx-speaking villages.
Mr O Cuiv will also visit the Isle of Man parliament and the Manx Museum during his two-day trip.
Enhancing East-West relations under the remit of the British Irish Council will also be a priority.
In 1998, to mark the 50th anniversary of the Manx language recordings, the original discs were digitally remastered by the Manx National Heritage and donated to the Department of Irish Folklore at UCD.
This week, Mr O Cuiv also visited Scotland to discuss ways of sharing knowledge in areas such as island infrastructure, and rural development.