7 Heads Terms

7 Headed Serpent is aplied to Hydra who is sometimes 9 Headed 100 Headed. 7 Headed Serpent is also applied to Ananat. http://www.frankcaw.com/Leopard-Beast-666.html Euripides, with characteristic exaggeration, gave it ten thousand heads. Seven is usually the accepted number, possibly because of the seven rivers in this part of the Peloponnesian peninsula, tributaries of the river Amymone. http://www.dibonsmith.com/hya_con.htm RugievitWest Slavonic A local tutelary, a seven-headed warrior God associated with the South Baltic island of Rugen. See also, Svantavit. Semargl (Seven-Head) Pan Slavonic God of soil and fertility, one of the eight primary deities. Like Rugievit, whom He may be a variant of, He was represented as man with seven heads. http://web.raex.com/~obsidian/SlavPan.html#Vainamoinen
According to legend, when Karttikeya was first born on Earth he possessed seven heads, one for each star of the Pleiades, but he lost one of them and so now he has six.  Thus, more than simply reflecting the Pleiades, Murugan is the Pleiades
Rev 17:9 And here [is] the mind which hath wisdom. The seven heads are seven mountains, on which the woman sits.