/ Antisemitism in Poland; is it safe for a Jew to live in Poland?
I believe the reason would be more to do with the economic conditions in the country migrants choose to go to. Ireland has always been poor that is why the population fell by 50% in less than 100 years. What chance did any migrant have of makeing a living when the indigenous population couldn't.
Prominent Irish Jews
William Annyas, mayor of Youghal.
Leopold Bloom, fictional protagonist of Ulysses.
Robert Briscoe, member of the Irish Republican Army during the Anglo-Irish War and twice Lord Mayor of Dublin (1956 and 1961).
Ben Briscoe (son of Robert Briscoe), former Fianna Fáil T.D. and Lord Mayor of Dublin (1988).
Michelle Citron, feminist film, video and multimedia producer, scholar and author.
Daniel Day-Lewis (dual Irish and British citizen), actor.
Gerald Goldberg, Lord Mayor of Cork in 1977.
Rabbi Yitzhak HaLevi Herzog, Chief Rabbi of Ireland from 1919 to 1937, later of Palestine and Israel.
Chaim Herzog, sixth President of Israel.
Max Eager (son of George Eager), first Chief Rabbi of Ireland.
Sir Otto Jaffe, Lord Mayor of Belfast (1899 and 1904).
Immanuel Jakobovits, Chief Rabbi of Ireland between 1949 and 1958, later British Chief Rabbi.
Louis Lentin, director (documentary films, television, theatre).
David Marcus, author, editor, broadcaster and lifelong supporter of Irish-language fiction.
Yaakov Pearlman, Ireland's Chief Rabbi.
Alan Shatter, Fine Gael TD and former party spokesperson for justice.
Mervyn Taylor, former Labour Party T.D. and Irish Minister for Equality & Law Reform.
Gustav Wilhelm Wolff, founder of Harland and Wolff shipbuilders.
Max Nurok, Israeli Consul-General to Australia, subsequently Israel's first Ambassador to Australia. 
Mike Shallcross, prominent paralegal at D.C. law firm
This is a little off topic