Jehan Perrenodz of La Sagne was born towards the end of the 15th century, and among his children was one known as "Grand Guillaume" either because of his size, or because he had a younger brother with the same forename (not uncommon at a time of high child mortality, when parents wanted to be sure that a family name survived). Within a few generations, the surname of this branch became established as Grandguillaume-Perrenoud. Grand Guillaume died in the late 1550s.
One of his sons, also called Guillaume, was a labourer at Marmoud, near La Sagne, and married Susanne Matile. They had six known children, including David Grandguillaume-Perrenoud, who married Jeanne Perret. Among David and Jeanne's children was Jonas Grandguillaume Perrenoud, who lived at Marmoud, and died in 1687. His wife's name is unknown, but he had at least five children, including Abraham (or Abram), a labourer at Petit-Martel in the second half of the 17th century.
Abraham acquired a rather cumbersome nickname, which for a time was used as the family surname: "Grandguillaume-Perrenoud-dit-le-Corbe". There were extensive peat bogs along the valley of La Sagne and Les Ponts-de-Martel, and "corbe" is an old patois word for peat, so perhaps Abraham produced turf for burning. He and his wife Susanne had nine known children, including another Abraham, who was born in about 1684, and confirmed at Les Ponts-de-Martel in 1700, and Jonas (see below).
Abraham became an elder in the church at La Sagne, and married Anne-Marie Robert in Les Ponts-de-Martel on 21 January 1714. Anne-Marie was christened in Les Ponts-de-Martel on 26 September 1691, and was the daughter of Jacob Robert and Manne-Marie Matthey-Prévôt. Abraham and Anne-Marie had seven children, all christened in Les Ponts-de-Martel.
Abraham and Anne-Marie's youngest child, Marie-Esther Grandguillaume-Perrenoud, was christened in Les Ponts-de-Martel on 15 April 1729, and married Claude Pethoud there on 14 October 1749. They had a daughter, Marguerite Pethoud, who was christened in Les Ponts-de-Martel on 26 July 1750, but Claude had problems with the law, spending time in prison for theft, and by 1755 had been "banished" from the principality of Neuchâtel. Marie-Esther had another daughter in 1755, also called Marie-Esther, who was declared illegitimate and given the surname Grandguillaume-Perrenoud in the baptismal register, as was a third daughter, Rose-Marguerite, in 1763.
Marguerite Pethoud had an illegitimate daughter, Charlotte Pethoud, born in Les Ponts-de-Martel on 3 April 1775. She later married Isaac-Henri Perrenoud, a widower with several children in Les Ponts-de-Martel on 18 January 1780, and had three more children with him. Charlotte is sometimes recorded with her stepfather's surname Perrenoud, but there is no clear indication that Isaac-Henri was her biological father. Charlotte married Victor-Aimé Vuille in La Sagne on 9 February 1805.