I found the following information in my files, obviously some McGing had done some research, so here it iss for your edification:
Westport Quay, located south west of Westport town was built in the late 1700s by the Brownes of Westport who were the largest landlords in County Mayo. They had previously constructed the town of Westport and encouraged the settlement of potential business men and had encouraged the growth of linen manufacturing among their tenants. The Quay consisted of a harbour capable of accommodating large ocean-going vessels and an impressive block of warehouses. The level of anticipated trade which Westport Quay was capable of handling never materialised and several of the warehouses went completely unused. Shortly after the construction of the Quay the linen industry in Mayo went into sharp decline and no alternative exporting industry replaced it. The advent of the railroad network in the 1860s, which was extended to Westport Quay not alone failed to bring additional business to the Quay but instead provided a cheaper and faster means of goods distribution than the coastal shipping trade.
Austin McGing was a writing clerk who resided in Westport Quay. It is not known if he was employed by one of companies who imported or exported from there or if he was employed by the harbour authorities.
Kinnewry (also spelled Kinnury) takes its name from the Irish Cionn lubhraighe which means 'head of the yew' and probably refers to a location one located near an ancient yew wood. In the l9th century it was the property of the Blakes of Belmont, near Tuam, Co. Galway. In 1838 it was let in small farms of about 2 1/2 acres at a rent of £140 per annum for the whole townland through Patrick Kinnaun of Kinnewry, the Blake's agent. By 1855 the townland was owned by Charles Grotty (1812 - 1883) who resided in Kinnewry and farmed 425 acres. The remainder was let to twelve tenant families in 1855."The soil is very light and the crops are only middling". The townland contains 1036 acres of land.
The surname McGinn and its variant form McGinn is in Irish Mag Fhinn, a variant of Mac Finn which means "descendant of the fair haired". Finn is the more common Anglicisation but McGing and McGinn are found in Counties Derry and Mayo. The surname may have evolved locally in County Mayo, or given its relative rarity, have come from the northern counties ip the 1600s or 1700s where there were several waves of migration to Mayo. The "census" of 1695 lists MacGinne as the principal surname in the Barony of Oneilland in County Armagh. The most famous bearer of the surname was William Maginn (1792 - 1842), apparently a native of Dublin, who left Dublin in 1828 and became one of the foremost personalities in the literary and journalistic field in London.
In Mayo the surname, under its various spellings, is found chiefly in the civil parishes of Oughaval, Cong, Breaghwy, Aghagower, Kilbeagh, Ballyovey, Ballinrobe, Kilbeagh and Ballintober with the greatest concentrations being found in the parishes of Oughaval, Aghamore and Ballintober.
From Sr. Helen:
Today also I went through Griffith's Valuation, 1855.
Union of Westport.
Killaghoor Philip M'Ging (This is just above the town.)
High Street Philip M'Ging (These are the same person, my great grandfather.)
Cloonmonad Austin M'Ginn
The Quay. John M'Ginn
Deerpark East Michael M'Ginn
Patrick M'Ginn Sr.
Patrick M'Ginn Jr.
Union of Ballinrobe.
James M'Ginn (Pat)
Cappaduff West Michael M'Ginn
Barony of Clanmorris
Cong Bridget M'Ging
Counties of Galway and Mayo - Union of Ballinrobe.
Ballyweeaun Patrick Ging
Kilbride John M Ging ?
When looking at all of this it seems to me that the McGings settled in two spots mainly, Glenmask calling themselves M'Ginn, and Arderry/ Tonlegee calling themselves Ging/ M'Ging. Moyhastin McGinns are connected to the Croaghrimbeg McGinn's and the Glenmask lot I think They are Michael (Bridge Street ) McGings. Austin from Cloonmonad and Michael from Deerpark East could be related to the Glenmask crowd also.
Our lot called Ging/McGing appear mostly in the Aughagower registers as such. They do not often appear as McGinn, I think, but this I would have to go into again. I would like to get hold of the early rent rolls for the Glenmask area. The Glenmask Census of 1883 gives McGing as the name. Could they all have changed their names so soon from M'Ginn in 1855 to McGing in 1883?. Were these lists written out much more recently?What I am wondering is are the M'Ginns all related as we think the M'Gings are. Have all the world-wide McGing connections come from these relatively few families.? I know Michael Joe King said we came from Bohaun but no McGings or McGinns appear in Griffith's V.so I'll happily settle for Arderry. Other places one would have expected to find them in - they are not there. e,g. Derreendafdeerg, Tourmakeady