There are five Frank Bonsals with direct genetic sequence and with ties to Baltimore, Maryland.
'Frank A. Bonsal', (one of 13 children) born 1871, Tidewater Virginia, died Baltimore, Maryland, died 1924, Baltimore.
'Frank A. Bonsal', (only child of Frank A. Bonsal and Ellinor Stewart) born Frank A. Bonsal, Jr., Baltimore, died 1980, Baltimore.
'Frank A. Bonsal, Jr.' (eldest of three children of Frank A. Bonsal and Edith Bass) born Frank A. Bonsal III, 1936, Baltimore.
'Frank A. Bonsal III' (eldest of three children of Frank A. Bonsal, Jr. and Helen Baldwin) born Frank A. Bonsal III, 1964, Baltimore. Personal landing page here.
'Frank A. Bonsal IV' (youngest of three children of Frank A. Bonsal III and Helen Baker) born Frank A. Bonsal IV, 2006, Baltimore.