"Official" first name was John Charles Laserte.
↑ Marriage record as cited by Sheila Beardslee. Also on that marriage record are the names of his parents, Jean-Baptiste Laserte and Agnes Lord.
Marriage and family:
Name: John Charles Laserte
Marriage Age: 34
Record Type: Marriage
Birth Year: abt 1881
Birth Place: Leominster, Massachusetts
Marriage Date: 25 Oct 1915
Marriage Place: Manchester, New Hampshire, USA
Father: Jean Baptiste Laserte
Mother: Agnes Lord
Spouse: Marie A Georgette Grenier
New England Historical Genealogical Society; New Hampshire Bureau of Vital Records, Concord, New Hampshire. Ancestry.com. New Hampshire, U.S., Marriage and Divorce Records, 1659-1947 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2013.