Louisa Gwilt Leach was born in 1850 in Quebec, Canada.

She was the third wife of William Turnbull Leach (1805-1886), Archdeacon, professor and vice-principal of McGill University, and the first rector of St. George’s Church. Her daughter Milda Emilie Leach Day (1871-1939) was one of the first women graduates of McGill University (1892).

She died on June 24, 1935, in Montreal, Quebec.

David Skirving Leach was born in July 1841, in Toronto, Ontario. He was a lawyer based in Montreal, Quebec. In 1867, he married Frances Harriet Pillans (1850–1924). He died on November 15, 1921, in Quebec, Canada.

Isaac Lea was an American conchologist, geologist, and publisher, who was born on March 4, 1792, in Wilmington, Delaware. After fighting in the War of 1812, he married Frances Ann Carey (1799–1873), daughter of Irish-American publisher Mathew Carey. Mathew Carey. When Carey retired in 1825, he left his publishing business in the hands of his son (Henry Charles) and Isaac Lea. In 1846, when Henry Charles Carey retired, the publishing house became Lea & Blanchard, and, when Lea himself retired and his sons took over the business, it became known as Lea Brothers.
In retirement, Isaac pursued his scientific interests in natural history, collecting objects and publishing scientific papers in the transactions of Philadelphia's scientific societies on the topic of freshwater and land mollusks. The National Museum at Washington owns his immense collection of freshwater mussels, as well as other collections. He died in 1886 in Philadelphia.
In 1829 Edgar Allan Poe wrote a poem dedicated to Lea called "To Isaac Lea".

L.E. Waterman Company established by Lewis Edson Waterman in 1884; incorporated in 1887.

William Dawson Le Sueur was born on February 19, 1840, in Quebec City, Quebec.

He was a Canadian civil servant, author, and critic. In 1856, he moved to Toronto to work at the provincial Post Office Department. He received his B.A. degree from the University of Toronto in 1863. He also studied law at Osgoode Hall Law School but never practiced. He continued to work as a clerk with the post office and relocated with the department to Ottawa in 1865. In 1888, he became its chief secretary, a position he held until his retirement in 1902. He published over 80 articles on a wide variety of topics. He was a freelance journalist for the Montreal Daily Star, the Montreal Gazette, and the Ottawa Citizen. In 1906, he published a biography of Louis de Buade de Frontenac. In 1903, he was made a Fellow of the Royal Society of Canada and served as its president from 1912 to 1913. He was awarded an honorary Doctor of Laws degree from Queen's College in 1900.

In 1867, he married Annie Jane Foster (1840–1922). He died on September 23, 1917, in Ottawa, Ontario.

James MacPherson Le Moine was born on January 21, 1825, in Quebec City, Quebec.

He was a lawyer, author, and historian. He studied at the Petit Séminaire de Québec and after being articled to Joseph-Noël Bossé, he was called to the bar of Lower Canada in 1850. He practised law in Quebec City until 1858. Then he devoted himself wholly to his work as a collector of inland revenue, an office he had held since 1847, and from Oct. 12, 1869, to Dec. 31, 1899, to his duties as an inspector in the same department. In 1860, he moved to Spencer Grange, a villa set in the heart of a 40-acre estate in Sillery. He was involved with the Literary and Historical Society of Quebec, helping in the development of their natural history museum, and later serving as president in 1871, 1879–1882, and 1902–1903. From 1894 to 1895, he was the president of the Royal Society of Canada. In 1897, he was made a Knight by Queen Victoria. In 1901, Bishop’s College in Lennoxville conferred on him an L.L.D. honoris causa. He published several books, e.g., "Maple Leaves: A Budget of Legendary, Historical, Critical, and Sporting Intelligence" (7 vols., 1863-1906), "Ornithologie du Canada", (2 vols., 1860-1861), and "Les pêcheries du Canada" (1863).

In 1856, he married Harriet Mary Atkinson (1830 –1900). He died on February 5, 1912, in Ste. Colomb-de-Sillery, Quebec.

Leon Philippe Le Métayer-Masselin was born on May 1, 1831, in Guichainville, Normandy, France.

He was a merchant, archaeologist, numismatist, and botanist from Normandy. In 1852, he married Léontine Masselin (1835–1877), the daughter of Jean-Baptiste Masselin, a ribbon manufacturer in Bernay. He added his father-in-law's name to his own. He became interested in archaeology and numismatics in 1856, conducting research on ancient archives and performing excavations. Around 1862, he and his father-in-law commissioned the construction of a private mansion in Bernay, designed by architect Adolphe Bouveault.

Around 1865, he moved to the Paris region, where he presented himself as a paleographer, archivist, and numismatist. In 1867, he sold a library of over 2,000 books in Paris. He became a member of various organizations, including the French Archaeological Society for the Conservation of Historic Monuments, the Society of Antiquaries of Normandy, the Free Society of Agriculture, Sciences, Arts, and Belles-Lettres of Eure, and the Academy of Cherbourg (National Academic Society of Cherbourg). He served as an inspector for the Normandy Association in the canton of Bernay and was also a member of the Commission for the Topography of Gaul. In 1862, he received 500 francs from the CTG to excavate in Berthouville (Eure).

In 1874, he emigrated to Canada with his two daughters, Marie and Élisa, and his son Raoul. He claimed that financial promises from the Canadian government and encouragement from the bookseller Bossange lured him there to establish a ribbon factory, initially in Saint-Hyacinthe and later in Chambly. Unfortunately, his venture failed, leading to accumulated debts and prompting him to publish an anticlerical pamphlet.

Around 1879, he began referring to himself as Le Métayer de Guichainville and sought opportunities as a botanical collector at the National Museum of Natural History in Paris. Eventually, he moved to New York, where he worked as a private French tutor and numismatic expert, even selling a coin collection in 1881. Newspaper articles, sometimes sensational in nature, portrayed him as a ruined nobleman, specifically as Baron or Marquis de Guichainville, living in poverty with his children, one of whom was blinded in a traffic accident in 1911.

He died on October 1, 1911, in New York City, New York.