The Alban surname was used in South Wales and Germany in the 1800's. The Welsh name seems to have been used as a first name in rememberance St. Alban, a christian martyr who was killed in about 400 CE. In Wales up to the 1700's the father's first name was used to identify the sons, ie Alban's son was named Thomas ap Alban, and Thomas' sons were named ap Thomas. This means that not all Alban families had the same ancestors and two Alban families living near each other might not be related.
Some southern european names such as Albani were shortened to Alban.