First name of first wife is found in Salisbury Vital Records:
p. 138-139 (Births):
[HOYT]
Thomas, s John and Frances, 1: 11:m 1640
Gregorie, s John and Frances, 1: 11m: 1640
Elizabeth, d John and Frances, 23: 12 m: 1642
Sarah, d John and Frances [2d w Ct. R.], 16: 11m: 1644
Mary d John and Frances [2d w ct. r], 20: 12m: 1645
Joseph, s John and Frances, 2d w., 13: 3m: 1648
Joseph, s John and Frances, 2d w., 27: 9m: 1649
Marah, d John and Frances, 2d w., 24: 9m: 1653
Naomy, d John and Frances, 2d w., 23: 11m: 1654
Dorethie, d. John and Frances, 2d w., 13: 2m: 1656
Mehetabel, d John sr and Frances, 25: 8m: 1664