From Where Does The Surname Originate? ^{meaning and history}

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I disagree with your website's stated origin of this surname, I believe it is a derivation from the surname De Lacey, which you do not have an origin for, so this may help both:

De Lacy (Lascy, Lacie, Lacey) is an old Norman noble family originating from Lassy (Calvados). The first records are about Hugh de Lacy (1020 - 1049). His descendents left Normandy and came to England along with William the Conqueror. Walter and Ilbert de Lacy fought in the battle of Hastings. The family took a major role in the Norman conquest of England and Ireland.

Walter de Lacy (1046, Lassy (Normandy) 1089, Hereford) was a companion of William I of England and came to England in the year 1066 to fight in the battle of Hastings. Walter de Lacy was buried at Gloucester Cathedral.

Ilbert de Lacy (1045, Lassy (Normandy) 1093, Pontefract) built Pontefract Castle on land granted by William I of England.

Walter had a daughter, Emma, born 1080 who married Hugh Talbot.

They had a son, Gilbert, born 1102, but for some reason he insisted on keeping his mothre's name.

They had a son Hugh, born 1125, and that is where it gets interesting. In 1160 he married Rosa de Clare, a half-sister of Strongbow.

Strongbow, or Richard Fitz Gilbert De Clare (born 1130) had married Eve MacMurchada, daughter of Dermot MacMurchada, and as a result of this, and in return for his fighting support had been promised to be made King of Leinster on Dermot's death.

Strongbow and Eve had 2 children, a son Gilbert, who died in infancy, and a daughter, Isabel (died 1220). She married William Marschal (died 1219) in 1189 when she was seventeen years old. He was forty three. They had ten children, five boys, five girls, William, Richard, Gilbert, Walter, Anselm, Matilda, Isabel, Sibila, Eva, and Joan. All five sons died violent and sometimes mysterious deaths, with rumours and theories abounding that a deliberate attempt was made by Henry III to extinguish a potential rival bloodline with royal claims..

Of these ten children, Lynch interest centres on Isabel, but mention will be made of William and Richard again. Isabel went on to have seven children, Richard, Maud, William, Gilbert, Amicia, Anges and Isabel. Of these, Maud will feature later.

Returning to Hugh de Lacy, born 1125, who married Strongbow's half sister, Rosa, in 1160. He did not travel with Strongbow's invasion in 1170. Instead he arrived in 1171, at the request of Henry II, who by then was nervous of Strongbow's position in Ireland, and in order to dilute it, he granted Hugh and other knights some of the lands that Strongbow had acquired.

Hugh de Lacy and Rosa had 3 children, a daughter born 1162, and sons Hugh and Walter born 1168, 1170. Hugh (2) went on to be the first Earl of Ulster, Walter was lord of Meath and Ludlow.

No year of death has been established for Rosa, but in 1178, Hugh married again. Obviously not for too much disruption, this time he married Rose. This was Rose O'Connor, daughter of Rory O'Connor, last high king of Ireland, and a constant thorn in Strongbow's side, Strongbow having been called back to England in 1175 to co-sign the Treaty of Windsor between O'Connor and Henry II.

Hugh de Lacy was summoned back to England in 1180 to explain his Irish (and not pure blood Norman) connections. By this time Hugh and Rose had a son, William de Lacy. It was then decreed that due to being half-Irish, William would not be allowed retain the Norman name of De Lacy. Neither was he entitled to Norman lands or possessions. Hugh was killed in a skirmish near Durrow 1185.

William had joined with his half brother Hugh in attacking William De Marschal's (Strongbow's grandson) lands in Ireland until 1224 when Hugh was captured and brought to England. After William was poisoned in 1231, his brother Richard inherited his Irish estates. Richard, who spent considerable time in France, in the company of the Frenc h King, had fallen out of favour with Henry III, or at least some of his advisors, namely Peter des Roches, bishop of Winchester, who had managed to get Richard declared a traitor, and as such, his lands in Ireland were up for grabs. William De Lacy returned to his old ways, and when Richard came to Ireland to defend them, it was William de Lacy who had him killed in 1233.

William had a son, John. For reasons already outlined, John was known as De Lynch, not De Lacy. John was the first Lynch to settle in Galway, but before he did, he took a wife, one Maud De Clare. This Maud was also mentioned previously. She was the daughter of Isabel, who was Strongbow's grand-daughter whose brother Richard had died at the hands of her son-in-law's father, William De Lacy.

John settled in Galway and had a son called Nicholas, who, due to his sallow complexion became known as Nicholas Dubh Lynch rather than De Lynch (Dubh being the Gaelic Irish for Black or dark). When subsequent generations were less sallow, this became the start of the native Galway tribe of Lynch.