It looks like a Veronica. Perhaps V. americana

thanks very much for the i.d. wanda. now the mystery is where it came from because i have never heard of it. probably it arrived in a pot with some other plant. min

Thanks Remy...this has been driving me crazy since I too received it at the summer exchange, and now it has bloomed. Very sweet and thanks for finding and sharing this information. Ginny B.

They look like genuine English bluebells, Hyacinthus non-scripta ie not Spanish blue bells. However, leaves are fairly broad so maybe a hybrid between the two. If you do move them put them in dappled shade, not full sun. Imagine an English woodland environment in May.