In the Arabic language, Shaytan is derived from Shatana, which means the far thing. Hence, the Shaytan has a different nature than mankind, and his sinful ways are far away from every type of righteousness. It was also said that Shaytan is derived from Shata, (literally 'burned'), because it was created from fire. Some scholars said that both meanings are correct, although they state that the first meaning is more plausible. Further, Siybawayh (the renowned Arab linguistic) said, "The Arabs say, 'So-and-so has Tashaytan,' when he commits the act of the devils. If Shaytan was derived from Shata, they would have said, Tashayyata (rather than Tashaytan).'' Hence, Shaytan is derived from the word that means, far away. This is why they call those who are rebellious (or mischievous) from among the Jinns and mankind a `Shaytan'.
And so We have appointed for every Prophet enemies ـ Shayatin (devils)
among mankind and Jinn, inspiring one another with adorned speech as a
delusion (or by way of deception) (6:112).
In addition, the Musnad by Imam Ahmad records that Abu Dharr said that the Messenger of Allah said,
O Abu Dharr! Seek refuge with Allah from the devils of mankind and the
Jinns. Abu Dharr said, "I asked him , `Are there human devils' He
Furthermore, it is recorded in Sahih Muslim that Abu Dharr said that the Messenger of Allah said,
" The woman, the donkey and the black dog interrupt the prayer (if
they pass in front of those who do not pray behind a Sutrah, i.e. a
barrier). Abu Dharr said, "I said, `What is the difference between the
black dog and the red or yellow dog' He said,
The black dog is a devil."
Also, Ibn Jarir At-Tabari recorded that Umar bin Al-Khattab once rode a Berthawn (huge camel) which started to proceed arrogantly. Umar kept striking the animal, but the animal kept walking in an arrogant manner. Umar dismounted the animal and said,
"By Allah! You have carried me on a Shaytan. I did not come down from
it until after I had felt something strange in my heart.''
This Hadith has an authentic chain of narrators.
So, shaytaan are among mankind and Jinns and also, some other creatures mentioned above. It is merely the title for the rebellious and mischievous ones of them.
Regarding one who defied Allah, it was Iblees and yes, progeny of Iblees live among Jinn kind. Allah says (Interpretation of meaning):
“Will you then take him (Iblees) and his offspring as protectors and
helpers rather than Me while they are enemies to you?” [al-Kahf 15:50]
They dwell in ruins and unclean places.
The Prophet (peace and blessings of Allaah be upon him) said: “These
toilets are haunted (inhabited by devils), so when anyone of you goes
to the toilet let him say, ‘A’oodhu Billaahi min al-khubthi
wa’l-khabaa’ith (I seek refuge Allaah from the male and female
devils).” Narrated by Abu Dawood, 6; classed as saheeh by al-Albaani
in Silsilat al-Ahaadeeth al-Saheehah, 1070.
They will also face death, for they are included in the words of Allaah (interpretation of the meaning):
“Whatsoever is on it (the earth) will perish” [al-Rahmaan 55:26]