'Angami-related' is a compound formed in modern English from 'Angami' (the name of the Angami people/ethnic group) and the adjective 'related' (from English 'related').

'related' ultimately comes from Latin 'relatus', the past participle of 'referre' (re- 'back' + ferre 'to carry'); it passed into Old French and Middle English as words meaning 'reported' or 'brought back' before developing the sense 'connected'. 'Angami' is the English name for the Angami people (a Naga ethnic group) adopted into English from the group's own name and regional usage, and the compound 'Angami-related' is formed in modern English by combining the ethnonym with 'related'.

Initially, components like 'relatus' had senses of 'brought back' or 'reported'; over time 'related' acquired the broader sense 'connected to' or 'having a relation to,' which is the sense used in the compound 'Angami-related'.