There were 2 Rebeccas born, this was the first, the second was born in 1693, so this one likey died an infant
In his will, Richard only mentions 2 sisters: Sarah and Carrinah

Birth Rebeca Jupp; Surrey, England, Baptisms, Marriages and Burials, 1538-1812; Croydon, St John; 1653-1696; image 61 of 114 @ancestry.com; Source Information: Ancestry.com. Surrey, England, Baptisms, Marriages and Burials, 1538-1812 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2013.
Original data: Anglican Parish Registers. Woking, Surrey, England: Surrey History Centre.
Name: Rebeca Jupp
Event Type: Baptism
Birth Date: 10 Apr 1692
Baptism Date: 19 Apr 1692
Parish: Croydon, St John
Father's Name: Richard
Mother's name: Rebeca
Reference Number: 2888/1/3

IGI Births (searching for Carinah then looking for other Jupps with same)
England & Wales Christening Records, 1530-1906 @ancestry.com
+Richard Jupp Croydon, Surrey, England; b 30 Jun 1700
Father's Name: Richard Jupp; Mother's Name: Rebecca
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.
Sarah Jupp 5 May 1704; Croydon, Surrey, England; b 21 Apr 1704
Age at Christening: 0
Father's Name: Richard Jupp; Mother's Name: Rebecca
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.
+Carinah Jupp 8 Nov 1710 Croydon, Surrey, England; b 8 Nov 1710
Age at Christening: 0
Father's Name: Richard Jupp; Mother's Name: Rebecah
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.
ALSO
+Rebeca Jupp 19 Apr 1692 Croydon, Surrey, England; b 17 Apr 1692
Father's Name: Richard Jupp; Mother's Name: Rebeca
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.
Rebeca Jupp 13 Sep 1693 Croydon, Surrey, England
Father's Name: Richard Jupp
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.
-Marey Jupp Dec 1695 Croydon, Surrey, England; b 23 Dec 1695
Father's Name: Richard Jupp; Mother's Name: Rebecca
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.
+Elizabeth Jupp Croydon, Surrey, England; b 16 Aug 1697
Father's Name: Richard Jupp; Mother's Name: Rebecca
Source Citation: Place: Croydon, Surrey, England; Collection: St John the Baptist; -; Date Range:  1653 - 1723; Film Number: 994331.