The name Tenly means Dennis' Field and is of English origin. Tenly is a name that's been used primarily by parents who are considering baby names for girls.
From an English surname which is actually a variant of the name Towneley, which is comprised of the Old English elements tun meaning "enclosure, settlement" and leah meaning "wood, clearing." Would have been used for families who lived (settlement) near or next to a clearing in the woods (field).