Muruga in Ramayan

Valmiki Ramayan
Book II : Ayodhya Kanda - Book Of Ayodhya

Chapter[Sarga] 25

Verse 11

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स्मृतिर् धृतिः च धर्मः च पान्तु त्वाम् पुत्र सर्वतः
स्कन्दः च भगवान् देवः सोमः च सबृहस्पतिः
२-२५-११
सप्त ऋषयो नारदः च ते त्वाम् रक्षन्तु सर्वतः

See this keenly स्कन्दः

11. putra = Oh; son! ; smR^itiH = veda; the smrititexts; dhR^itishcha = Resolution and satisfaction personified as a daughter of Daksha and wifeof Dharma ; dharmashcha = piety personified; paatu = may protect ; tvaam = you; sarvataH = from all sides. Bhagavaan = The gracious Lord; devaH = thediety; skandashcha = Skanda; somashcha = the moon-god; saH = that; bR^ihaspatiH = Brihaspati; preceptor of gods; saptarshhayoH = the sevensages ; naaradashcha = Sage Narada; rakshhantu = may guard; tvaam = you; sarvataH = on all sides.

Translation

"May Veda, the Smriti texts taken as one body, the resolution and the piety protect you, my son! May lord Skanda (the younger son of Lord Siva)and the moon god along with the sage Brihaspati(the preceptor of gods), the well known seven sages as well as Sage Narada guard you on all sides."
 
Hence Ramayan have reference for the god muruga names as Kanda in tamilnadu. You can see that Kousalya, Mother of rama belssing her son with the names of god who will protect Ram during in the forest.
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