A reader recently asked me the origin of the name LYNCH
there is a lot of reading on the net re this name and I have submitted some links

HISTORY of the surname Lynch
... It must be emphasized at once that the name Lynch, which is among the hundred commonest surnames in Ireland, is of dual origin. Lynch is used as the anglicized form of the native Gaelic names O Loingsigh, and also of the Norman de Lench. the Norman family of Lynch, though far less numerous than their Gaelic name-sakes, have been more prominent on account of their predominance in the affairs of Galway city, where they were the most influential of the \"Tribes\". In the hundred and seventy years which elapsed between 1484, when Dominick Lynch procured the city\'s charter from Richard III, and 1654, when Catholics were debarred from civic offices, no less than eighty-four mayors of Galway were of the family of Lynch. Dominick\'s son, Stephen Lynch, was in turn responsible for obtaining from Pope Innocent VIII the Bull which established that unique ecclesiastical institution, the Wardenship of Galway. Many of the Wardens were Lynches
... * The Sligo sept has Alan O\'Lynch, noted Dominican Prior of Kildare (1411), to its credit.
* From that of Breffny came Dr. John Joseph Lynch (1816-1888), Bishop of Toronto, the first Catholic ecclesiastical dignitary to attend a British royal levee since the time of James II.
* Col. Charles Lynch (1736-1796), from whose name the American word to lynch, or \"lynch law\", was coined, was son of another Charles Lynch, scion of the northern sept whose head in early mediaeval times was chief of Dalriada.
* The Lynches of Co. Donegal are properly Mac Loingseachain *Lynchehaun); those, O Loingsigh (of Lynch), now numerous in Cork, Kerry and Limerick, probably stem from the septs of the name located in Corca; Laoidhe and in Owney(more at link)



from wikipedia surname Lynch
... Lynch is a surname of Irish origin. The Lynch family of Galway were one of the Tribes of Galway, and of Anglo-Irish origin. The original form of the surname, de Linch, indicated a now unknown place of origin, possibly in England. It is from this wealthy landowning line that Patrick Lynch, who moved to Argentina, was from; including descendant Che Guevara
... Lynch, which is today one of the most common surnames throughout Ireland, is unusual in that it has two completely distinct origins.
* The first is Norman, from de Lench, possibly derived from a French placename now forgotten. The family settled initially in Co. Meath, and a branch then established itself in Galway, where they rapidly became one of the strongest of the famous \"Tribes of Galway\"; between 1484 and 1654 no fewer than 84 mayors of the city were Lynches. One of their number, James Lynch, mayor in 1493, is reputed to have hanged his own son for murder when no one else could be found to carry out the sentence.
* The second origin for the name is Gaelic, from the Irish O Loingsigh, grandson of Loingseach, meaning \"seaman\". Given the importance of the sea in Irish life, the surname naturally arose quite separately in a number of areas, including Clare/Limerick, Sligo, west Cork, Cavan, Donegal and the north Antrim/Derry region. In west Cork, the family were initially among the leaders of the Tuath O nDunghalaigh, based near the modern town of Clonakilty, and are recorded in the 16th and 17th centuries as chiefs of an area in the Beara peninsula, in the parish of Kilcaskan

Origin of Lynch Surname
... First of all it is an anglicised form of the Gaelic surname O?Loingsigh. Grandson of Loingsearch, meaning ?mariner?. Originally anglicised O?Lynch, the prefix ?O? has by now largely fallen into disuse. There were a number of distinct and independent septs of the name Lynch in medieval times. Perhaps the most important of these was the Thomond sept who held its lands chiefly in Clare and Limerick. This group is mentioned in the following lines from O?Heerin:
?The O?Lynches, men of lands,
Dwell in that wood opposite the foreigners?. (more at link)

Australian + New Zealand
Lynchs to Australia came first as convicts and later as settlers.
James Lynch from Cork, for instance, was transported on the convict ship Asia in 1824
... some Lynch settlers in Australia in the 19th century
* Caroline Lynch arrived in Adelaide aboard the ship \"Seppings\" in 1839
* James Lynch arrived in Adelaide aboard the ship \"Seppings\" in 1839
* James Lynch arrivedin Adelaide aboard the ship \"William Bicol\" in 1840
* Mary Lynch arrived in Adelaide aboard the ship \"Abberton\" in 1840
* William Lynch arrive in Adelaide aboard the ship \"Britannia\" in 1846

The arms illustrated are a classic example of the simplicity of Norman heraldry
This Galway coat of arms is for the family James Lynch, mayor in 1493 (see above)