Charles Thornton Jefferies was born abt. 1805 in Bristol, England.

He was a printer, bookbinder, bookseller, and stationer. He ran the printing and bookselling business C.T. Jefferies & Sons from the historic Canynge House in Bristol, England. In 1881, the bookstore premises survived a damaging fire.

In 1828, he married Sarah Sanforth (1811–1871). He died on January 28, 1884, in Bristol, England.

Novelist and naturalist Richard Jeffries was born on a farm near Swindon in Wiltshire. As a young man he learned shorthand and began writing for journals. He published his first novel in 1874, and in 1876 moved to London. Both his novels and his periodical essays centre on country life, his descriptions of the Wiltshire landscape and of the interaction of the human and natural worlds being especially evocative. Jeffries died almost destitute following a long illness; sympathy aroused by these circumstances lead his friends to establish a fund for his family.

Edith Mary Gwyn Jeffreys was born in 1847 in Oystermouth, Glamorgan, Wales.

She was a talented sculptor and painter who exhibited for the first time at the Royal Academy Summer Show of 1885 and whose painting “Daydreams” was bought by Pitt-Rivers. She was living at Bedford Gardens in London at the time and between 1886 and 1889 she exhibited another 8 pieces at the Royal Academy (mostly terra cotta). In 1889, she received honours for her exhibited work at Paris International Exhibition.

She died on January 6, 1946, in Granville, Normandy, France.

John Gwyn Jeffreys was born on January 18, 1809, in Swansea, Wales.

He was a barrister, conchologist, malacologist, and author. He was educated in Swansea at the Bishop Gore School. In 1826, he became an apprentice to one of the principal solicitors of Swansea, before going to London in 1838. In 1856, he was called to the bar in London but his greater passion was for conchology. He was not satisfied simply to form a collection but was interested in all aspects of the biology of mollusks. In 1840, he became a Fellow of the Royal Society. In 1866, Jeffreys retired from the law and continued a series of dredging operations he started in 1861 aboard the yacht Osprey. Accompanied by other specialists in marine life, he dredged the seas around the Shetland Islands, the west of Scotland, the English Channel, the Irish Sea, and Norway. He participated in several deep-sea expeditions as a scientific leader, e.g., the Porcupine expeditions (1869, 1870), the Valorous expedition to Greenland in (1875), and the French Travailleur expedition (1880). He served as Justice of the Peace for Glamorgan, Brecon, and Hertfordshire, and was appointed High Sheriff of the latter in 1877. He was Treasurer of the Linnean Society of London and the Geological Society of London for many years. He was also a member of the British Association for the Advancement of Science. He was awarded an honorary degree of LL.D. from St. Andrews University. Jeffreys was the author of a number of books and articles on conchology and the mechanics of sea dredging, e.g., "British Conchology, or an Account of the Mollusca Which Now Inhabit the British Isles and the Surrounding seas" (5 vols., 1862-1865).

In 1840, he married Anne Morely Nevill (1815–1881). He died on January 21, 1885, in Kensington, Middlesex, England.

Jeffry Cyprian was a legal professional working in Portsmouth, New Hampshire.