English: unenrolled deed poll
Welsh: gweithred newid enw anghofrestredig
Subject: Cyfraith
Welsh definition: Gweithred newid enw na wnaed cofnod cyhoeddus ohoni drwy ei chofrestru yn y Llysoedd Cyfiawnder Brenhinol.
English context: At the age of 18 a person can change their name by enrolled deed poll. Young people over 16 can change their legal name by unenrolled deed poll without requiring consent of those with parental responsibility. Learners under 18 can also change their legal name by enrolled deed poll with consent from all those with legal responsibility. 
Plural: gweithredoedd newid enw anghofrestredig