The question
Why do the two main numerology systems give different numbers for the same name?
The short answer
They use different letter tables. The Pythagorean table runs the alphabet through 1 to 9 in order; the Chaldean table groups letters by traditional sound values and never uses 9. Both are modern systems despite their ancient names.
What science knows
Historical FactThe Pythagorean system, the more common in the West, was popularised in early 20th-century numerology books. The “Chaldean” system was popularised by Cheiro in the 1920s.
The real Chaldeans, the astronomer-priests of Babylon, wrote in cuneiform, which is not an alphabet, so they could not have used letter values.
The pattern
Established MathematicsThe two tables side by side:
| Value | Pythagorean | Chaldean |
|---|---|---|
| 1 | A J S | A I J Q Y |
| 2 | B K T | B K R |
| 3 | C L U | C G L S |
| 4 | D M V | D M T |
| 5 | E N W | E H N X |
| 6 | F O X | U V W |
| 7 | G P Y | O Z |
| 8 | H Q Z | F P |
| 9 | I R | (not used) |
What is still uncertain
Mixed EvidencePractitioners disagree on details, such as whether to use a birth name or an everyday name, and whether to keep compound numbers before reducing. There is no scientific evidence that either table describes personality.
Why humans find it interesting
Cultural TraditionChaldean practitioners traditionally treat 9 as sacred and leave it unassigned, and read compound numbers (such as 23) before reducing them to a single digit.
CUE perspective
CUE PerspectiveCUE works from birth dates, not names, so neither letter table drives a CUE reading.
Knowing where each system comes from lets you enjoy them for what they are: two modern ways of turning language into number.