Stoianu

Stoianu is a Romanian surname that may also appear as a toponymic component in some localities. It is most commonly encountered as a family name.

The surname is derived from the given name Stoian, which in turn is linked to the South Slavic name Stoyan. Romanian surname formation often attaches suffixes or consonantal endings such as -u, yielding Stoianu to denote lineage or place origin. The name is predominantly found among Romanian-speaking populations, with bearers in Romania and Moldova and in diaspora communities abroad.

Cognate forms and related names include Stoian, and the root Stojan appears in several Balkan languages, reflecting shared linguistic origins. Variants arise from transliteration and regional spelling, but Stoianu remains recognizably linked to Stoian.

There is no widely recognized geographic entity named Stoianu in major reference works; if any locality exists, it would be a small village or parish-level designation not widely documented.