So the fact that the 1608 men-and-arms census had only Jesper Beane and nobody with the Swinnerton name in Tetbury tells me that, most likely, most or all of the Swinnertons in Tetbury descended from him. It’s possible he had brothers or sisters, but I see no evidence at this point.
I have seen records for three marriages and two children of Jesper Beane/Swinnington, with circumstantial evidence for a third child. But there certainly may have been more children. He married Elizabeth Hornes in Eastington in 1600, and in that record (in Latin) his name is spelled Gasparis Swinnerton. But the Tetbury records between 1578 and 1616 are lost, so we don’t see records for their children’s baptisms.
Almost certainly Job Swinerton, born about 1601, was their first child. Job named his first son Jasper after his father. Whether Jesper and Elizabeth had more children is difficult to say. Elizabeth must have died around 1611, as Jesper married Katherine Birt in Shipton Moyne in 1612.
Katherine died in Tetbury in 1616. There is an assumption in most Ancestry trees I’ve seen that Jesper and Katherine did not have children during their short marriage, but I have seen records for the birth of two children- an unbaptized male infant who was born and died in Shipton Moyne in 1613, and Antipas, who was born in Shipton Moyne in 1615. The father for both of these births is given as Jesp Beane, rather than Swinnerton. But this is surely the same person. And so Katherine was the mother of Antipas, contrary to most family trees I’ve seen.
Jesper then married Ann Smith in 1616. The Tetbury records after 1615 are extant, and I have not seen further baptismal records for the family, so I assume they did not have children. For what it’s worth, in the 1608 census, Jesper was listed as being closer to 40 than 20, so it’s possible that he was born a fair bit earlier than the 1580 that many assume based on his marriage in 1600.
But one open question is: did Jesper and Elizabeth his first wife have children other than Job?
Also buried in Tetbury in 1616, other than Katherine, were the widow Ideth Swinnerton, and an Elizabeth Swinnerton. Perhaps Elizabeth was a sister of Jesper? Perhaps Ideth was the widow of his father Thomas? It is impossible to say for sure, but these are possibilities.
I have also found a couple of early Beane records in nearby Cherington. Thomas Beane was baptized February 24, 1572. And Elyzabeth “the daughter of Margaret Beane” was buried March 25, 1574. Possibly connected to this family somehow?