Surname Origin
First Name Entry

Iosaphat

A Greek and Latin biblical form of Hebrew Yehoshaphat, conventionally interpreted as ‘YHWH has judged.’

Last updated: 2026-08-12

Iosaphat is a masculine biblical given name: it is the form used in Greek and Latin biblical texts for Hebrew יְהוֹשָׁפָט (Yehoshaphat), the name usually written Jehoshaphat in English. Its conventional meaning is “YHWH has judged” or, with the divine name rendered as a title, “the LORD has judged.” Iosaphat is therefore Greek and Latin in its transmitted spelling, but Hebrew in its ultimate formation.

This is not an occupational name for a judge. Nor does use of the same biblical name show descent from the best-known bearer, the king of Judah.

Meaning and Hebrew Formation

The standard Brown–Driver–Briggs Hebrew lexicon treats יְהוֹשָׁפָט as a masculine personal name and glosses it “YHWH has judged.” It derives the name from the divine name YHWH and the Hebrew verb שָׁפַט (shafat), “to judge.” The result is a theophoric name: a personal name containing a reference to a deity.

The English word judge can mislead here. The Hebrew name is a statement about divine judgment, not a label for the bearer’s work. It should not be interpreted as evidence that an ancestor was a judge, magistrate, or legal official.

From Yehoshaphat to Iosaphat

The spelling becomes easier to understand when the forms are kept in their textual order:

  • Hebrew: יְהוֹשָׁפָט (Yehoshaphat).
  • Biblical Greek: Ἰωσαφάτ (Iōsaphat). Henry Barclay Swete’s edition of the Septuagint prints Ἰωσαφὰτ in 2 Chronicles 17:1.
  • Biblical Latin: Iosaphat. The Vatican’s *Nova Vulgata* uses this spelling throughout its account of the king in 2 Chronicles 17–21.
  • English: Jehoshaphat, the familiar English biblical form.

The ph in Iosaphat represents Greek φ (phi). Forms beginning with I, J, or Y belong to different spelling and transliteration conventions; they do not necessarily represent different original names. In a historical record, however, the exact form still matters because it can indicate the language or editorial convention used by the scribe or publisher.

Biblical Bearers

The king of Judah, son of Asa, is the best-known Yehoshaphat. He appears extensively in 1 Kings 22 and 2 Chronicles 17–21, where Greek and Latin versions call him by the forms behind Iosaphat. No claim of descent from him follows from later use of the name.

The Hebrew Bible applies the name to several other people as well. Brown–Driver–Briggs distinguishes six Israelite bearers, including Jehoshaphat son of Ahilud, a royal recorder under David and Solomon; Jehoshaphat son of Paruah, one of Solomon’s district officers; and a priest and trumpeter named Jehoshaphat. The “Valley of Jehoshaphat” in Joel is a place-name built from the same Hebrew form. A catalogue or index entry reading Iosaphat must therefore be identified by passage and context rather than assumed to refer to the king.

Later Forms and Christian Use

Iosaphat is principally a scriptural and learned form. Related vernacular spellings continued as personal and religious names. A concrete East Slavic example is Yosafat Kuntsevych (about 1580–1623), whose name is also romanized Josafat and Iosafat; the Encyclopedia of Ukraine identifies his secular name as Ivan. This example documents the related form’s Christian use, but it does not establish that the exact spelling Iosaphat was common in Ukraine or elsewhere.

When comparing records, plausible search forms include Yehoshaphat, Jehoshaphat, Iosaphat, Iosafat, Josaphat, Josafat, and Yosafat. These are useful linguistic leads, not proof that separately recorded people are identical.

A Similar Name with a Different Etymology

The medieval Christian story commonly called Barlaam and Iosaph or Barlaam and Josaphat creates a genuine trap. Its prince’s name resembles Iosaphat, but Jes P. Asmussen’s account in *Encyclopaedia Iranica* traces Iosaph through Middle Persian and Arabic transmission to bodhisattva. The story itself developed from Buddhist narrative material before passing through Middle Persian, Arabic, Georgian, and Greek versions.

That Iosaph/Josaphat should not be used as evidence for the Hebrew derivation of the biblical name. The forms became similar within Christian literary tradition, but their documented etymologies are different.

Given Name, Not Genealogy

The evidence above establishes Iosaphat as a biblical given-name form. It does not establish a hereditary surname history or a modern geographic distribution for the exact spelling. If Iosaphat appears in a surname field, the original record and surrounding generations must show whether it was actually inherited; an index can misclassify a given name, reverse name order, or regularize a spelling.

Likewise, shared use of Iosaphat or one of its variants does not demonstrate a shared family line. Etymology explains the name’s language history; genealogy requires records connecting particular people.

References