Could this be your William:
U.S. Naturalization record for William Maxwell Neill. William was age 55 and was a Salvation Army Officer. He was white, medium complexion, 5'10", 167 pounds, light? brown hair, brown eyes.
William was born in Belfast, Ireland on 6 June 1868. He was living at 33 Harmosa? Apartments, Seattle Washington. He emigrated to America from Winnipeg, Canada on the G.N. Ry.
William's wife's name was Louisa, who was born in London, England. She was residing in Winnipeg, Canada.
He arrived in America on 7 August 1923, Pembina?, North Dakota.
The paper was signed 15 August 1923.