I wish I had kept better records. Over the years I would order fall bulbs from FEDCO and get a nice flower display in the Spring. Some of these have died out over the years but one variety has actually spread outside it's planting bed. I suspect it may be a Scillia Siberica (Alba). It does have a wild hyacinth appearance. After experiencing the winter that wouldn't leave, these flowers were a most welcome sight.
Picture 1 (original plants)
Picture 2 (The "volunteers" spreading into the lawn)
Picture 3 (Detail of this delightful flower)