namam no. 368) hetuh (हेतुः) (హేతుః)

aum hetave namah (ओं हेतवे नमः) (ఓం హేతవే నమః)

He is called hetuh as He is the reason for the devotees getting that kind of devotion towards Him and later giving them the fruits of such devotion.

The words 'hetuh' and 'reason' are synonyms.

He is not just the reason for giving the fruits of devotion. He is also the source giving His devotees the required power of devotion as revealed by this  'hetu' namam.

It means that He is the reason, the cause, and the source of all deeds.

aum namo bhagavate vasudevaya!

PS: For the meanings of the other namams published earlier on this blog, please find them at the link given below:

http://value4value.blogspot.in/search/label/Vishnu%20Sahasra%20Nama%20Stotram