Daily AncestorIsab.
Isab. or Isb. in old records is an abbreviation of the first name Isabel or Isabella.
Isab. and Isb. are clerks' shortenings of Isabel, Isabella and Isabelle. Name lists give both forms, and the abbreviation alone does not tell you which spelling the woman used.
Look for the name in full in another record, such as a marriage or death entry, before you settle on Isabel or Isabella.
As seen in a recordName and relationship columns of the 1880 census
Isab. McKinnon, 28, Wife
Sources
How to cite this page
Daily Ancestor. "Isab.." Dictionary of Old Record Words. https://dailyancestor.com/dictionary/abbreviations/isab. Last checked 2026-10-12.