In French sources, Cœuriot's voice is described as "Dugazon", which was used to refer to light voiced singers in the high mezzo-soprano range or sopranos with a dark timbre to their voice. The couple were married on 24 January 1852 in La Guillotière, a commune of Lyon. See Lyon municipal archives. Marriage Register, Commune of La Guillotière, 1852, p. 18. Retrieved 21 February 2012.
Kutsch & Riemens (2003) p. 2202; short review in Le Ménestrelvol. 33, no. 44 (30 September 1866), p. 347: "Ismaël avait à effacer d'excellents souvenirs [de Meillet et Sainte-Foy], et c'est double mérité à lui d'avoir réussi dans le rôle de Sganarelle. Il y est bon comédien...."
In several sources, his name is given as Jean-Vital-Ismaël Jammes, including Fétis and Pougin (1880) p. 13. According to Vapereau (1870) p. 943, his parents were Jewish: "de parents Israélites".