The origin of Tambra is from Israel and is a Hebrew name. It is not well known, because it originally was used to name King of Israel's household pet dog, Tambra. From what I am told, the dog was Tamar's responsibility.
My mother gave me the name when the Rabbi declared that she had to name a Jewish name in order to be set apart for the Lord.
It is a name that is supposed to be "friend of the King". Also means Palm Tree, which ushers in the Messiah.