A name's Heart Number (also called the Heart's Desire or Soul Urge number) is calculated from the vowels only. Where the Personality Number describes how a person appears to others, the Heart Number describes what actually motivates them underneath: the private wants and values that drive their choices even when no one else can see them. Vowels are considered the "soul" of a name in Pythagorean numerology, carried through in speech even when consonants are dropped or mumbled.

A Heart Number of 11, a master number, points to an inner drive for meaning and inspiration. Underneath whatever this person shows the world, what they privately want most is to be a source of insight for others, even when they're still working out how to carry that responsibility themselves.