I believe that there is a brief treatment of the topic in:
Smith, Abbot Emerson. Colonists in Bondage; White Servitude and Convict Labor
in America, 1607-1776.
Its been years since I read it, and the work was originally published in 1947.
caveat emptor
On the other hand, you might want to take a closer look at Barbados - where many
Irish surnames survive today, as a result of 17th century "resettlement" policy
by HM Govt.
In addition, there were numerous Irish who died in and around New Orleans - as a
result of disease and accidents encountered during the construction of canals,
levees, etc... The story goes that slaves were simply too valuable to risk
their death in these labors, so the Irish who were at the bottom of the wage
heap took the work. There may be something on this in Fogel & Engerman or
Genovese's works dealing with the 'paternalism' of slave owners and dealers. It
would seem that this particular example might well qualify.
Tom Maloney
History Department
University of Wisconsin-Madison