As a Family Name
1.
Surname.
A Persian family name derived from hayāt (حیات, “life; existence; vitality”). The suffix ‑ī (ی) forms a relational adjective: “of life,” “vital,” or “pertaining to existence.”
Common across Iran, Afghanistan, and Tajikistan; carried by Persian-speaking communities worldwide.
2.
Adjective.
In everyday Persian, hayātī functions as an ordinary adjective meaning vital, essential, life-giving — as in niyāz‑e hayātī, “a vital need.”
این موضوع حیاتی است.
In mawzūʿ hayātī ast. — “This matter is vital.”
3.
Given name.
Used less commonly as a masculine given name in Persian and Turkish traditions, carrying the sense “my life” or “full of life.”