I have found a few spellings for his name. The most accurate spelling I can determine is Irvin Wilbourn Lacy, His first son was Irvin Willburn Lacy. He married Sarah Brumley, and they had five children. They also lived in Erath Co, before settling in Colfax Co. He was a cattle rancher, and was murdered in 1881 near Durango. I have a listing for him on findagrave.com. I have wondered if any of his siblings came out west, so this is great.