- Ruston
- Rusu
- Rutherford
- Rutledge
- Rutter
- Ryan
- Ryant
- Rybak
- Ryden
- Ryder
- Ryerson
- Rylant
- Ryman
- Rymsza
- Saathoff
- Sabater
- Sabin
- Sabo
- Sacchi
- Saccomano
- Sache
- Sachsen
- Sacket
- Sackett
- Sadik
- Sadler
- Safford
- Sage
- Sager
- Sahin
- Sailer
- Sain
- Saint John
- Saint Peter
- Saint Valery
- Salafia
- Sale
- Saley
- Salie
- Salin
- Salisbury
- Salmon
- Salsbury
- Salsman
- Salstrom
- Salter
- Saltonstall
- Saltsman
- Saltzman
- Salvador
- Salvaterra
- Salway
- Sammis
- Samples
- Sampson
- Samwell
- Sanborn
- Sanda
- Sander
- Sanders
- Sanderson
- Sandford
- Sandham
- Sands
- Sanford