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It is the entitlement and birthright of every person born in the island of Ireland, which includes its islands and seas, to be part of the Irish Nation. That is also the entitlement of all persons otherwise qualified in accordance with law to be citizens of Ireland.
… (Art. 2)

(1) Spanish nationality shall be acquired, retained and lost in accordance with the provisions of the law.
(2) No person of Spanish birth may be deprived of his or her nationality.
(3) The State may negotiate dual nationality treaties with Latin-American countries or with those which have had or which have special links with Spain. In these countries Spaniards may become naturalized without losing their nationality of origin, even if those countries do not grant a reciprocal right to their own citizens. (Sec. 11)

(1) The child of a Hungarian citizen shall be a Hungarian citizen by birth. A cardinal Act may specify other instances of the origin or acquisition of Hungarian citizenship.
…
(3) No one shall be deprived of Hungarian citizenship established by birth or acquired in a lawful manner.
(4) The detailed rules for citizenship shall be laid down in a cardinal Act. (Foundation, Art. G)

1. Everyone shall have the right to determine and declare his (her) nationality. Nobody shall be forced to determine and declare his (her) nationality.
… (Art. 26)

Naturalisation is granted by the federal legislative power. (Art. 9)

(1) In the following matters legislation is the business of the Federation, execution that of the provinces:
1. nationality;
… (Art. 11)

No one may be deprived of Icelandic citizenship. Loss of citizenship may, however, be provided for by law, in the event a person accepts citizenship in another State. An alien can only be granted Icelandic citizenship according to law.
… (Art. 66)

(1) If, on an application for naturalisation as a British citizen made by a person of full age and capacity, the Secretary of State is satisfied that the applicant fulfils the requirements of Schedule 1 for naturalisation as such a citizen under this subsection, he may, if he thinks fit, grant to him a certificate of naturalisation as such a citizen.
(2) If, on an application for naturalisation as a British citizen made by a person of full age and capacity who on the date of the application is married to a British citizen, or is the civil partner of a British citizen the Secretary of State is satisfied that the applicant fulfils the requirements of Schedule 1 for naturalisation as such a citizen under this subsection, he may, if he thinks fit, grant to him a certificate of naturalisation as such a citizen.
(3) This section is subject to sections 31, 32 and 36 of the Illegal Migration Act 2023 (restriction of eligibility for citizenship etc). (British Nationality Act 1981, Sec. 6)

1. Everyone is accorded the rights to personal identity, to the development of personality, to civil capacity, to citizenship,
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4. Deprivation of citizenship and restrictions on civil capacity may only occur in the cases and under the terms that are provided for by law, and may not be based on political motives. (Art. 26)

Every child of whose parents one is a citizen of Estonia is entitled to Estonian citizenship by birth.
Everyone who has forfeited his or her Estonian citizenship as a minor is entitled to its restoration.
No one may be deprived of an Estonian citizenship acquired by birth.
No one may be deprived of Estonian citizenship because of his or her beliefs.
The conditions and procedure for the acquisition, forfeiture and restoration of Estonian citizenship are provided in the Citizenship Act. (Sec. 8)