Goa or Gova/Gowa/Goya?

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Saw this float at the 2016 Republic Day parade in New Delhi.
goa float
Why is it “Gova/Gowa” in Devanagari? Why not गोआ ? In Konkani they use “Goya” (गोंय), as in Goenkarancho (English transliteration by Goans):goenkarancho
Very confusing.

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