Daitch-Mokotoff Soundex (D-M Soundex) is a phonetic algorithm invented in 1985 by genealogist Gary Mokotoff, and later improved by Randy Daitch, both of the Jewish Genealogical Society. It is a refinement of the Russell and American Soundex algorithms designed to allow matching of Slavic and Yiddish surnames with similar pronunciation but differences in spelling.

Daitch-Mokotoff Soundex is sometimes referred to as "Jewish Soundex" and "Eastern European Soundex", although the authors discourage use of these nicknames for the algorithm.

Improvements[edit | edit source]

Improvements over the older Soundex algorithms include:

  • Coded names are six digits long, resulting in greater search precision (traditional Soundex uses four characters)
  • Coded names can be stored as numeric values, which can save space in some applications (regular Soundex encodes values as alphanumeric text)
  • Several rules in the algorithm encode multiple character n-grams as single digits (American and Russell Soundex do not handle multi-character n-grams)
  • Multiple possible encodings can be returned for a single name (traditional Soundex returns only one encoding, even if the spelling of a name could potentially have multiple pronunciations)

Examples[edit | edit source]

Some examples:

Surname American Soundex D-M Soundex
Peters P362 739400, 734000
Peterson P362 739460, 734600
Moskowitz M232 645740
Moskovitz M213 645740
Auerbach A612 097500, 097400
Uhrbach U612 097500, 097400
Jackson J250 154600, 454600, 145460, 445460
Jackson-Jackson J252 154664, 454664, 145466, 445466, 154646, 454646, 145464, 445464

See also[edit | edit source]

External links[edit | edit source]

This page uses content from the English language Wikipedia. The original content was at Daitch-Mokotoff Soundex. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.
Community content is available under CC-BY-SA unless otherwise noted.