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Raj "Rajoo" Ranbir is an allonym. A compound of राज, raj: "king"1, रज्जु, rajju: "cord"2 and रणबीर, ranbir: "hero of battlefield"3
[1]. राज rāj [ad. rājan-], m. 1. king; prince; lord, master, ruler. 2. sthg. royal; anything the best or chief of its kind. 3. a mason, builder (= राजगीर). — (in cpds. 1राज often falls together with 2राज.)( McGregor, 860);
[2]. रज्जु rajju [S.], f. m. 1. f. string, cord. 2. m. f. Pl. HŚS. reins. 3. m. f. Pl. HŚS. braided hair ( McGregor, 852);
[3]. रण + बीर:
a. रण raṇ [S.], m. 1. battle; conflict; battle-field. 2. war. — रण-कौशल्य, m. military tactics. रण-छोड़, who flees from battle: a title of Kr̥ṣṇa. रणधीर, adj. steady in battle, brave. रण-भूमि, f. battle-field (McGregor, 852);
b. बीर bīr [vīra-], adj. & m. 1. brave, heroic, &c. (= वीर). 2. friend, brother (esp. as term of address). 3. magician. 4. reg. harmful spirits in a magicians's service. 5. ? f. an ear-ornament. 6. Brbh. a ornament of the wrist or forearm. — बीर-बहूटी, f. see s.v. (McGregor, 739);