Birth to an Ethiopian parent creates Ethiopian nationality. Birth in Ethiopia alone to two foreign parents is not general jus soli.
Sources: Ethiopia Proclamation on Ethiopian Nationality 378/2003
A spouse of an Ethiopian may naturalize after two years of marriage and one year of residence, instead of four years.
Sources: Ethiopia Proclamation on Ethiopian Nationality 378/2003
A child of an Ethiopian parent is Ethiopian by descent under the Nationality Proclamation.
Sources: Ethiopia Proclamation on Ethiopian Nationality 378/2003
Adults generally need about four years domicile in Ethiopia, lawful income, good character, ability to communicate in a national language, and release from prior nationality. Dual nationality is not recognized. Grant is discretionary.
Sources: Ethiopia Proclamation on Ethiopian Nationality 378/2003