DeLong
A surname often understood as a shortened French form of a place-based name meaning “of the long one” or “the tall man,” though the exact origin is not fully certain.
The #2,022 most common surname in the United States (2010 Census) — about 1 in every 17,302 Americans shares it.
Etymology
The most likely explanation is that DeLong is a French surname built from the adjective long, meaning “long” or by extension “tall.” In older surname practice, this could label someone by height or by a distinguishing physical trait, and in some cases it may reflect a reduced form of a longer French name beginning with de + long-. The historical excerpt also groups Delon with related French forms, which supports a French-language origin rather than a purely English one.
History
DeLong appears in French and French-influenced naming traditions, and later became established in North America, where the spelling is often written as one word with a capital D and L. The surname may also have been influenced by Anglicization and simplification after migration, which can make several originally distinct French forms look alike in modern records. Because the historical source is brief and partly abbreviated, the exact pathway for every family line cannot be pinned down from this excerpt alone.
Origin
Regions
Variant spellings
Fun fact
In French surname collections, forms built on long often overlap with place-names and nicknames, so DeLong can be tricky to classify without early family records.
From the historical record
“Delotn. Abr. de Delhom. Delon, Delong. Le long(Fland.). Delosne. l'artio sablonneuse d'uu ancien lit de rivière {losne, Est). Delotel. Qui est de l'hôtel, qui ap-”
— Dictionnaire des noms (French surnames)