The 100 most-researched names
- Dahl Scandinavian
- Dailey Irish
- Dale English
- Daley Irish
- Dalton English
- Daly Irish
- Dang Vietnamese
- Daniel Jewish
- Daniels Jewish
- Darby English
- Darling English
- Dasilva Portuguese
- Daugherty Irish
- Davenport English
- David Jewish
- Davidson Scottish
- Davies Welsh
- Davila Spanish
- Davis Welsh
- Davison English
- Dawson English
- Day English
- Deal English
- Dean English
- Decker German
- Dejesus Spanish
- Delacruz Spanish
- Delaney Irish
- Delarosa Spanish
- Delatorre Spanish
- Deleon Spanish
- Delgado Spanish
- Delossantos Spanish
- Dempsey Irish
- Dennis
- Denton English
- Desai Indian
- Devine Irish
- Dewitt Dutch
- Diamond
- Diaz Spanish
- Dick
- Dickens English
- Dickerson English
- Dickey Scottish
- Dickinson English
- Dickson Scottish
- Diehl German
- Dietz German
- Dill English
- Dillard English
- Dillon Irish
- Dixon English
- Do Vietnamese
- Doan
- Dobbs
- Dobson English
- Dodd English
- Dodge English
- Dodson English
- Doherty Irish
- Dolan Irish
- Dominguez Spanish
- Donahue Irish
- Donaldson Scottish
- Donnelly Irish
- Donovan Irish
- Dooley Irish
- Dorsey Irish
- Doss English
- Dotson English
- Dougherty Irish
- Douglas Scottish
- Downey Irish
- Downing English
- Downs English
- Doyle Irish
- Drake English
- Draper English
- Drew English
- Driscoll Irish
- Duarte Portuguese
- Dubois French
- Dudley English
- Duffy Irish
- Dugan Irish
- Duke English
- Dukes English
- Dunbar Scottish
- Duncan Scottish
- Dunham English
- Dunlap Scottish
- Dunn Irish
- Duong Vietnamese
- Duran Spanish
- Durham English
- Duvall French
- Dwyer Irish
- Dye English
- Dyer English
Every name starting D
The census file has many more. Choose the first two letters.