Most importantly, we use the last name to indicate the unit of the frequency (Hz) which is sam as cycle per second.

 The picture above is a portrait of Heinrich Hertz which one of the 56 portraits of Hamburg's citizen on the columns in the entrance hall of the Rathaus (Town Hall).  HIs portrait was the six out of seven Jewish portraits which was taken off by Nazis.  However, in 1949, the portraits were replaced.

rom STRUAN ROBERTSON HOMEPAGE

from Struan Robertson Homepage

To recongnition of his work, The Hamburg Television Tower, built between 1965 and 1968, is officially named the Heinrich-Hertz-Turm (Turm=Tower) in honour of the Hamburg born physicist.  It is by far the highest tower in Hamburg.  The overall height is 270 m, whereby the conical concrete shaft ends 204 m above the ground. At a height of 128-132 m there is a two-storeyed viewing platform and restaurant. Above this at a height of 150 m, projecting further out from the shaft, is the operations platform, and further above this six smaller antenna platforms. The NDR (North German Broadcasting) broadcasts its Second and Third radio programmes and the private television companies Sat1 and RTL broadcast their television programmes from here.

from http://www.hh.schule.de/hhs/english/school.htm

The picture next is the The Heinrich-Hertz-School in Hamburg, German.  In 1899, only five years after his death, Hamburg honoured Heinrich Hertz by naming a street in the district of Uhlenhorst after him: Heinrich-Hertz-Straße.  There are a primary school is named after him: Heinrich-Hertz-Grundschule and a Gesamtschule (comprehensive school): Heinrich-Hertz-Schule.  

 from http://www.th.physik.uni-frankfurt.de/~jr/gif/stamps/stamp_hertz.jpg

This is the stamp for recoginze the one of great physicist Heinrich Hertz.