Apparently Evan McColl (I wonder if "Ewan" was a mistake or intentional - they are both the same name of course) emigrated to Canada - here's some information about him from an encyclopedia:

MacCOLL, Evan, Canadian poet, born in Kenmore, Argyleshire, Scotland, 21 September, 1808. He received a good education, and in 1837 became a contributor to the " Gaelic Magazine" published in Glasgow.

In 1831 MacColl's family emigrated to Canada, but he remained behind, and in 1837 was appointed a clerk in the Liverpool custom-house. In 1850 he removed to Canada, and soon afterward obtained a situation in the Kingston custom-house, where he remained till he was retired in 1880.

During his residence in Canada he has written numerous poems, chiefly of a lyrical character, the most, noted of which is "My Rowan Tree." He has been for many years the bard of the St Andrew's society of Kingston. He has published in book-form " Clar-sach Nan Beann, or Poems and Songs in Gaelic" (Glasgow, 1837; new edition, 1886), and " The Mountain Minstrel, or Poems and Songs in English" ; third Canadian edition of his works (Toronto, 1887). See Wilson's "Poets and Poetry of Scotland" (New York, 1876).

His daughter, Mary Jemima, born in Liverpool, England, 7 May, 1847, was educated in Kingston, Ontario, taught for several years, and in 1881 married Professor Otto Henry Schulte, of Hasbrouck institute, Jersey City, New Jersey She is the author of "Bide a Wee, and other Poems" (Buffalo, 1879; 4th ed., Toronto).