Mahabharata

Duryodhana named his twin son and daughter as

1. Laxman Kumara or simply Laxman 
2. He had a twin sister called Lakshmana

Links

http://en.wikipedia.org/wiki/Laxman_Kumara

http://vaniquotes.org/wiki/She_(Laksmana,_Duryodhana's_daughter)_was_a_very_highly_qualified_girl_of_the_Kuru_dynasty,_and_many_princes_wanted_to_marry_her._In_such_cases,_the_svayamvara_ceremony_is_held_so_that_the_girl_may_select_her_husband_according_to_her_own_choice

Viswamitra Wakes Up Rama

Usually, at the palace, Rama would be woken up with music. But that is not possible in the forest. Here, Viswamitra wakes Him up with His verses, beginning with the words, ‘Kausalya Supraja Rama.' 
http://en.wikipedia.org/wiki/Dakshina_Kosala_Kingdom
https://www.youtube.com/results?search_query=Kousalya+Supraja+Rama
But why does the sage compose verses to wake up only Rama and not Lakshmana? Rama is lying down on the grass, with Lakshmana beside Him. Lakshmana is an avatara of Adi Sesha, the serpent on which the Lord reclines. Could it be that Lakshmana has assumed the form of Adi Sesha, so that Rama can sleep on Him? Therefore, when Viswamitra comes to wake up Rama, he perhaps does not see Lakshmana, and so composes his verse to wake up Rama and not Lakshmana. This is one possible explanation.

Sambukumaran

http://publishing.cdlib.org/ucpressebooks/view?docId=ft5q2nb449&chunk.id=d0e1455
http://maddy06.blogspot.in/2011/04/surpanakha-story-of-woman-scorned.html

Wisdom Lib

http://www.wisdomlib.org/search.html?search_input=Lakshmana