- R
- Rabunsky
- Racey
- Radar
- Rader
- RaderReider
- Radtka
- Rafter
- Ragan
- Rahe
- Rahme
- Railey
- Raines
- Raish
- Ralls
- Ralph
- Ralston
- Ramey
- Ramirez
- Ramsburg
- Ramser
- Ramsey
- Randall
- Randell
- Randle
- Randol
- Randolph
- Rankin
- Rankins
- Raodcap
- Rappoldt
- Rasnick
- Ratcliff
- Ratcliffe
- Ratliff
- Rauhof
- Raum
- Rawley
- Ray
- Raynes
- Rea
- Reamer
- Reamy
- Reardon
- Rebori
- Rebstock
- Reday
- Redd
- Redekop
- Redford
- Redifer
- Rediford
- Redwood
- Reed
- Reeder
- Reedy
- Reefe
- Reeke
- Rees
- Reese
- Reeves
- Regan
- Regel
- Regis
- Reherd
- Rehmann
- Reid
- Reider
- Reiers
- Reil
- Reilly
- Reim
- Reinard
- Reinbold
- Reish
- Reiter
- Renalds
- Rennex
- Reubush
- Reuwer
- Reveley
- Revene
- Revercomb
- Rexroad
- Rexrode
- Reyer
- Reyes
- Reynolds
- Rhea
- Rhinehart
- Rhineheart
- Rhoades
- Rhoads
- Rhodecap
- Rhodeffer
- Rhodes
- Rhorer
- Rhubush
- Ribble
- Rice
- Ricedorf
- Richard
- Richards
- Richardson
- Richbourg
- Richcreek
- Richereek
- Richmond
- Richter
- Rickard
- Rico
- Riddel
- Riddle
- Riddleberger
- Ridenour
- Ridgely
- Ridings
- Ridlle
- Rife
- Riffle
- Riggleman
- Riggleman Dove
- Riggold
- Riggs
- Riglemon
- Riley
- Rimel
- Rimer
- Rinaca
- Rinace
- Rinehart
- Riner
- Ring
- Ringer
- Ringgold
- Ringgoldl
- Ringold
- Rinker
- Rinker-Foster
- Rio
- Rion
- Rippetoe
- Risch
- Rising
- Risser
- Ritchey
- Ritchie
- Ritenour
- Rittenour
- Ritter
- Rivercomb
- Roach
- Roacher
- Roadcap
- Roads
- Roberson
- Roberts
- Robertson
- Robey
- Robinson
- Robison
- Robson
- Roche
- Rochet
- Rock
- Rockefeller
- Rockliff
- Rockwell
- Rodamer
- Rodbell
- Rode
- Rodecap
- Rodeffer
- Rodehafer
- Roderfer
- Roderffer
- Rodes
- Rodgers
- Rodriguez
- Rodriquez
- Rods
- Roffenbarger
- Roger
- Rogers
- Roggleman
- Rohart
- Rohr
- Rohrbaugh
- Rohrer
- Roland
- Rolar
- Roler
- Roller
- Rolley
- Rollins
- Rolon
- Rolston
- Romjue
- Rontopoulos
- Roof
- Rooney
- Root
- Rosazza
- Rose
- Rosenberger
- Ross
- Rosser
- Rossignol
- Rosson
- Rostas
- Roston
- Roth
- Roth Rhodes
- Rothgeb
- Rothger
- Roudabush
- Rounds
- Rouse
- Roush
- Rousseau
- Row
- Rowan
- Rowe
- Rowland
- Rowley
- Rowman
- Royer
- Royers
- Royston
- Rubush
- Ruby
- Rucker
- Ruckman
- Ruddle
- Rudy
- Rue
- Ruebuck
- Ruebush
- Ruff
- Ruffner
- Ruleman
- Rumsey
- Runcle
- Runion
- Rupe
- Ruppenthal
- Rush
- Rusmisel
- Ruso
- Russell
- Rust
- Ruth
- Rutherford
- Rutherforde
- Ryabchuk
- Ryan
- Ryder
- Ryman