When William Leach was born in 1839, in Worsbrough, Yorkshire, England, United Kingdom, his father, Michael Leach, was 25 and his mother, Mary Jaggar, was 21. He lived in Darfield, Yorkshire, England, United Kingdom in 1841. He died in 1842, at the age of 3, and was buried in Worsbrough, Yorkshire, England, United Kingdom.
English: occupational name for a physician, from Middle English leche, lache ‘physician’ (Old English lǣce ‘leech; physician, blood-letter, surgeon’). The name refers to the medieval medical practice of bleeding, typically by applying leeches to a patient. The surname is recorded in the late 14th-century Poll Tax Returns for men whose occupation is stated as medicus ‘physician’, or occasionally spicer (spicers acted as apothecaries), but some men named le Leche have unrelated occupations including cultor ‘cultivator, farm laborer’, which suggests that leche could refer to an amateur ‘medicine man’ who supplied folk remedies.