While the masculine form Ralph was always quite popular, the feminine form was extremely rare outside of French-speaking contexts, where the diminutive form was the most common.

England

Early Modern English

● 1555 Raphe StAnthonlin p. 11

Middle French

◑ 1587 Rauline WCS p. 89; 1591 Rauline ibid. p. 49; 1592 Rauline ibid. p. 50; 1594 Rauline ibid. p. 51; 1598 Rauline ibid. p. 52

France

Middle French

◑ 1562 Rauline RegPCC-1 p. 12; 1563 Rauline ibid. p. 31; 1564 Raullette ibid. p. 52, Raulline ibid. p. 62; 1565 Raulette ibid. p. 162, Rauline ibid. p. 109, Raullette ibid. p. 133; 1566 Rauline ibid. p. 196, Raullette ibid. p. 257; 1567 Rauline ibid. p. 278, Raulline ibid. p. 337; 1568 Raulette ibid. p. 378, Rauline ibid. p. 415; 1570 Rauline ibid. p. 427; 1571 Rauline ibid. p. 456; 1572 Rauline ibid. p. 491