From Wiktionary, the free dictionary
Semi-learned borrowing from Sanskrit राजन् (rā́jan) or Pali rājan. Doublet of ރަދުން (radun̊)
ރާދަ • (rāda)
- of royal lineage, of royal blood, royal
- Hassan Ahmed Maniku (2000) “ރާދަ”, in A Concise Etymological Vocabulary of Dhivehi Language, Colombo: The Royal Asiatic Society of Sri Lanka, page 202