olemus
lapsele sünni registreerimisel pandud nimi,
isikunimi sünnitunnistuse järgi

Wiktionary:
a name chosen for a child at birth, as opposed to a different name used subsequently
Her birth name was Elizabeth, but everyone called her Lizzie.
In California the credit card companies must issue a credit card in a person's birth name or married name, whichever the customer prefers.

ülevaateid
https://en.wikipedia.org/wiki/Birth_name

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