Various sources, such as Pythagoras, the Greek philosopher, the ancient Chaldeans, the mystic and mysterious Brahmins of India, and the sages of ancient China, are given credit for the formation of Numerology. Among these, the Chaldean and Pythagorean schools of numbers are the most widely used.

Although the Chaldean numerology is older, the Pythagorean system of numbers is far more popular.
No one has yet traced out the exact date of the origin of numerology or numbers. Suggestions about Numerology are made in the holy books like the Bible, the Talmud, the Koran and even in the Egyptian book of the dead.

The Chaldean system has its roots in Ancient Babylon. It is connected to the Vedic System of India and the Kabbalah System of the Hebrew mystics. As per the Chaldean System every letter has a unique vibration, and numbers are assigned to letters based on the vibration value. The 9 is considered holy and therefore is kept apart from other vibrations, except when it results as the sum of vibrations (e.g., from an individual's name). In Chaldean numerology, compound numbers always used. Single digits represent the outer aspects of a person, while double digits reveal inner influences.

This is the Chaldean Numerology calculator

Letters are assigned numeric values from 1 to 8.

Pythagoras

The originator of much of what we call Numerology today, is the ancient Greek mathematician, Pythagoras of Samos (569-470 BC). Pythagoras, known as the Father of Modern Numerology, studied the systems of India, Arabia, Persia, Palestine, Phoenicia, Chaldea, Babylon and Egypt. Numerology numbers are assigned by sequence in the Pythagorean System.

Numerology implements the method of character analysis that uses the numbers of names and birth dates to solve the eternal questions. Numerologists following the Pythagorean theory use a letter chart to assign numerical values to your name. They use the basic numbers 1 through 9 that are almost universally accepted in Numerology circles and the Master numbers 11 and 22.

Each letter in the English alphabet has a numeric value that is surrounded by certain energies. The total of the numbers in your birth date and the total of the value derived from the letters in the name provide an interrelation of vibrations.
Numerology is widely accepted all around the world and many people depend on it for naming businesses, babies and even change their names.

To sum up we can say, as per Numerology, the day you were born and your name marks an important part in shaping your personality.

This is the Pythagoras Numerology calculator

Letters are assigned numeric values from 1 to 9.