अन्वयः

तथा and, एकादशाहम् eleven days, अतीत्य having completed, नामकर्म naming ceremony, अकरोत् he (Vasishta) performed, महात्मानम् illustrious one, ज्येष्ठम् eldest son, रामम् as Rama, कैकयीसुतम् the son of Kaikeyi, भरतम् as Bharata, सौमित्रिम् a son of Sumitra, लक्ष्मणमिति as Lakshmana, अपरम् the other son, शत्रुघ्नम् as Satrughna, परमप्रीत: highly delighted, वसिष्ठ: Vasishta, तदा then, नामानि कृतवान् gave names.

M N Dutt

When the eleventh day had gone by, the king performed the Naming ceremony of his sons. And experiencing great delight, Vasistha conferred the names. And the high-souled eldest one was called Rāma; and Kaikeyi's son was called Bharata; and Sumitrā's son was called Laksmana, and the last was named Satrughna.

Summary

After a lapse of eleven days, the naming ceremony was performed. Highly delighted preceptor Vasishta named Kausalya's son Rama, Kaikeyi's son Bharata, one son of Sumitra, Lakshmana and the other Satrughna.

पदच्छेदः

अतीत्यैकादशाहं	अतीत्य (√अति-इ + ल्यप्)–एकादशन्–अहर् (२.१)
तु	तु (अव्ययः)
नाम	नाम (अव्ययः)
कर्म	कर्मन् (२.१)
तथाकरोत्	तथा (अव्ययः)–अकरोत् (√कृ लङ् प्र.पु. एक.)
ज्येष्ठं	ज्येष्ठ (२.१)
रामं	राम (२.१)
महात्मानं	महात्मन् (२.१)
भरतं	भरत (२.१)
कैकयीसुतम्	कैकयी–सुत (२.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
अ	ती	त्यै	का	द	शा	हं	तु
ना	म	क	र्म	त	था	क	रोत्
ज्ये	ष्ठं	रा	मं	म	हा	त्मा	नं
भ	र	तं	कै	क	यी	सु	तम्