Little is known about 33625989Hawise de Clare. Indeed, her father's identity—67251978Richard de Clare—is known from only one record, and it doesn't even mention 33625989Hawise; see explanation below. This same record also helps prove that 33625989Hawise married 33625988Geoffrey de Say.

Since we know that 33625989Hawise's father was 67251978Richard de Clare, we can infer that her mother was 67251978Richard's wife, 67251979Amice de Gloucester.1

Problem: Resolved Who was 33625989Hawise's father? The following is copied from: Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families, 2nd edition, (Salt Lake City, Utah, 2013), volume IV, pages 563-564. New research indicates that Geoffrey de Say, the Magna Carta baron, actually married Hawise de Clare, daughter of Richard de Clare, Earl of Hertford. Gerald Paget notes that Geoffrey de Say had scutage of the knights fees 7 March 1215, which he held of the Earl of Clare in free-marriage (see Paget Baronage of England (1957) 485: 3-4 (sub Say), cites C. 16 John m. 7.) About 1235 Geoffrey's widow, Hawise, and their son, Willam de Say, jointly issued a charter regarding property in Edmonton, Middlesex (see O'Connor Cal. Cartularies of John Pyel & Adams Fraunceys (Camden Soc. 5th Ser. 2) (1993): 240).

33625989Hawise's name is known from only one record: A charter pertaining to property in Edmonton names 33625989Hawise, 33625988Geoffrey de Say, and their son 16812994William. The charter insinuates that 33625989Hawise was a widow. It's not dated but was probably made circa 1235.2

Sources Cited:

1: Curia Regis Rolls, Volume I (London, 1922), page 186.

2: S. J. O'Connor, Calendar of the Cartularies of John Pyel & Adams Fraunceys (Camden 5th series, volume 2) (1993), page 240, entry 271.