According to the 1st page at Gematria Calculator for 666, the following phrases can be calculated to 666 in Jewish Gematria (which is not the same as the numbering in Strong's Hebrew Concordance) are as follows:

Number of A Man Barack Obama, 

El Barack Hussein Obama II, 

Lucifer Is The Hidden God, 

The Beasts Microchip ID

There are 324 more pages showing other words and phrases for 666, but I didn't take the time to look at all the pages.