Isleifur as a Baby Name. Meaning and Origin of Isleifur

What is the meaning of the name Isleifur ?

The baby name Isleifur is a Male name , 3 syllables long and is pronounced IPA: /ˈis.leivʏr/ — respelling: "EES-lay-vur".

Isleifur is Icelandic, Norse in Origin.

Ísleifur is an Icelandic masculine given name deriving from Old Norse Ísleifr, built from ís “ice” and leifr “heir, descendant; relic.” The compound yields the sense “heir/descendant of the ice,” often taken as an evocation of Icelandic identity and landscape. The modern -ur ending is the regular Icelandic nominative masculine ending added to the ancient base.

The name is attested in medieval Iceland and was borne by Ísleifur Gissurarson (c. 1006–1080), the first bishop of Iceland, which anchored it in ecclesiastical records and saga culture. While never very common, it has persisted at low frequency in Iceland and remains sanctioned by the Icelandic Naming Committee; beyond Iceland it is rare. Variants and related forms include the Old Norse Ísleifr/Isleifr, the standard modern Ísleifur, and accentless Isleifur or Isleif in international use; cognates are Leifur and Leif. Diminutives are uncommon.

⚙ Isleifur doesn't appear in any of the birth registries or name datasets we track. That's typically a sign of a rare name, a regional or traditional one, or a modern coinage. Either way, it remains a genuinely rare choice.