Dvaraka was the city Lord Krishna founded to protect the people of Mathura.
Reference: Srimad Bhagavatam chapter 50
Janie Mama...Ya tu suzikaI ya turnminaYa tu yavanaHey yavanaTurnmina suzikaIt is a Jamaican song, an island called Santiago and colonised by Spain till 1655, when the British took it. The most convincing answers I've found are these:ya tu sabes in Spanish means "Ya know," "You already know," "You know what I mean," or similar.Turnmina, Suzika and Yavana are all girls' names. Ya tu..., I ya... and Hey... are all "Hi there! I see you!.." types of greetings. So basically, the song is greeting these girls, and Janie Mama as well. The origin is Spanish.
There's Yellow Claw, published by Marvel Publishing, Yelena Rossini published by vertigo, Yandroth published by Marvel Publishing, and many more that stuck out to me at comicvine.com under the character section letter Y.