Keithley rhymes with:
keathley, keithly, keathley, keithly, bimonthly, blithely, deathly, earthly, fourthly, keathley, keithly, monthly, unearthly, worthley
Keithley sounds like:
kadel, kastel, kastl, kastle, keadle, keathley, keatley, keidel, keitel, keithly, kestel, ketola, kettell, kettle, kettlewell, kiddle, kidwell, kittel, kittell, kittle, kostal, kotila, kotula, kudla, kudlow