Seko,
We of the Haudenosaunee also have rites of adpotion in our Great Law.
Wampum #66
The father of a child of great comeliness, learning, ability or specially loved because of some circumstance may, at the will of the child's clan, select a name from his own (the father's) clan and bestow it by ceremony, such as is provided. This naming shall be only temporary and shall be called, “A name hung about the neck???
Wampum #67
Should any person, a member of the Five Nations' Confederacy, specially esteem a man or woman of another clan or of a foreign nation, he may choose a name and bestow it upon that person so esteemed. The naming shall be in accord with the ceremony of bestowing names. Such a name is only a temporary one and shall be called "A name hung about the neck." A short string of shells shall be delivered with the name as a record and a pledge.
Wampum #68
Should any member of the Five Nations, a family or person belonging to a foreign nation submit a proposal for adoption into a clan of one of the Five Nations, he or they shall furnish a string of shells, a span in length, as a pledge to the clan into which he or they wish to be adopted. The Chiefs of the nation shall then consider the proposal and submit a decision.
Wampum #69
Any member of the Five Nations who through esteem or other feeling wishes to adopt an individual, a family or number of families may offer adoption to him or them and if accepted the matter shall be brought to the attention of the Chiefs for confirmation and the Chiefs must confirm adoption.
Wampum #70
When the adoption of anyone shall have been confirmed by the Chiefs of the Nation, the Chiefs shall address the people of their nation and say: "Now you of our nation, be informed that such a person, such a family or such families have ceased forever to bear their birth nation's name and have buried it in the depths of the earth. Henceforth let no one of our nation ever mention the original name or nation of their birth. To do so will be to hasten the end of our peace.
Wampum #74
When any alien nation or individual is admitted into the Five Nations the admission shall be understood only to be a temporary one. Should the person or nation create loss, do wrong or cause suffering of any kind to endanger the peace of the Confederacy, the Confederate Chiefs shall order one of their war chiefs to reprimand him or them and if a similar offence is again committed the offending party or parties shall be expelled from the territory of the Five Nations.
Wampum #75
When a member of an alien nation comes to the territory of the Five Nations and seeks refuge and permanent residence, the Chiefs of the Nation to which he comes shall extend hospitality and make him a member of the nation. Then shall he be accorded equal rights and privileges in all matters except as after mentioned.
Wampum #76
No body of alien people who have been adopted temporarily shall have a vote in the council of the Chiefs of the Confederacy, for only they who have been invested with Chieftainship titles may vote in the Council. Aliens have nothing by blood to make claim to a vote and should they have it, not knowing all the traditions of the Confederacy, might go against its Great Peace. In this manner the Great Peace would be endangered and perhaps be destroyed.
Wampum #77
When the Chiefs of the Confederacy decide to admit a foreign nation and an adoption is made, the Chiefs shall inform the adopted nation that its admission is only temporary. They shall also say to the nation that it must never try to control, to interfere with or to injure the Five Nations nor disregard the Great Peace or any of its rules or customs. That in no way should they cause disturbance or injury. Then should the adopted nation disregard these injunctions, their adoption shall be annulled and they shall be expelled.
The expulsion shall be in the following manner: The council shall appoint one of their War Chiefs to convey the message of annulment and he shall say, “You (naming the nation) listen to me while I speak. I am here to inform you again of the will of the Five Nations' Council. It was clearly made known to you at a former time. Now the Chiefs of the Five Nations have decided to expel you and cast you out. We disown you now and annul your adoption. Therefore you must look for a path in which to go and lead away all your people. It was you, not we, who committed wrong and caused this sentence of annulment. So then go your way and depart from the territory of the Five Nations and from the Confederacy.
I can say however, I have never had anyone foolish enough to try and tell me they were adopted!