Aham tvam sarvago deva
In the Harivamsa (Kailasa-yatra Chapter), Mahesvara says addressing Sri Krishna:
I am you, O All-pervading God! You are verily Myself, O Janardana. Between us there is no difference, either in words or in their import, O Lord of the world!
"Those names of Yours, O Govind great in the world are, indeed, My names too. In regard to this matter, there is no room for doubt."
namani tava govinda
yani loke mahanti ca,
tanyeva mama namani
natra karya vicarana.
In the Visnu-sahasranama, there are quite a few names of Siva. Sivah, He who is pure because He is free from the three gunas (27), He who Purifies even when His name is remembered (600), Sambhuh, He who grants happiness to devotees (38), rudrah, He confers the good, or destroys sorrow and its cause (114), usanah, He who controls all beings (64)
Isvarah, He who is endowed with unconditioned splendor (36), He who is omnipotent (74), paramesvarah, the supreme Lord (377), bhutamahesvarah the great Lord of all Beings (489), Sarvesvarah the Lord of all lords (96), sthanuh, the Firm (28), sthirah, He who is always of one nature (203), svayambhuh, the self-born (37, sarvah, He who destroys all beings at that time of pralaya (26), mahadevah, the great God (491). There are also other names which indicate Siva's prowess and attributes: ugrah, the Terrible (421), Kamaha, the destroyer or desire (294), antakah, the Death of all beings (520), krtantakrt, the Destroyer of all that is made, of the god of death himself (537), pratardanah, He who destroyes (59), durgah, He who is gained with difficulty (779), durgamah, He who is not easily known (778), ksaminam varah, the chief among the yogins who have forbearance (919), mahatapah, the great ascetic, the great knower (122), yogi, the One who is realized through yoga of knowledge, or He who is with perfect self-possession (849), sadayogi, the eternal yogin (165), sannyasakrt, the one who has instituted the fourth asrama, i.e., sanyasa (580), bhesajam, the medicine for the disease - samsara (578), bhisak, the prescriber of medicine (579), vaidyah, the master of knowledge - disciplines (164).