There are many famous Irish sports people. Some may not be so well known in other countries and it would also depend on what sports people are interested in as to whether they would have heard of them. Some would be:
Eddie Irvine (Motor Racing)
Brian O'Driscoll, Ronan O'Gara, Paul O'Connell (Rugby)
Eamon Coughlan (Athletics)
Robbie Keane, Roy Keane (Soccer)
Tony McCoy (Horse Racing)
Padraig Harrington, Rory McIlroy (Golf)
Bono - most of the world know about Bono
C.Ronaldo
the most famous french sports person is Andree Brunet and Pierre Brunet!!!
Aaron Rodgers
Michael Jordan
My guess is Barry Bonds
Unique to ireland are Hurling and GAA football. However, their most successful biggest international sports would be rugby and possibly boxing second. Ireland have a relatively poor soccer team as of the past 6 years.
it is someone called rao'el ca'raoel
The most famous mountains in Ireland is the mountains of Mourne. These mountains are in northern Ireland. The Mourne Mountains are the most visited.
The JKennedys from Ireland are their most famous clan
Different Irish people would have different favourite sports. Gaelic Football and Hurling are the two most popular sports in Ireland, being the two national sports of Ireland. Other popular sports are soccer, rugby, golf, horse racing and many others.
There are many sports in Ireland and many great sport stars in those various sports. There are too many to mention and it is hard to compare stars in different sports. Even within any given sport, there will always be a great debate as to who is the best. So it is not a simple question to answer.