The meaning of the name Tenly is Dennis' Field. The origin of the name Tenly is English. This is the culture in which the name originated, or in the case of a word, the language.
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).