Did the name Jesus emanate from the Rig Vedic word ईश् (īś )?

 

I heard someone saying that Jesus Christ is a corrupt form of Shiva, a Hindu God. 

Jesus Christ is a Biblical character.

शिव - śiva - indicates auspicious one, but not any physical god mentioned as such in Puranas and generally believed.

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शिव - śiva was first used in Rig Veda. For example: Rig Veda 5.41.17.

iti cin nu prajāyai paśumatyai devāso vanate martyo va ā devāso vanate martyo vaḥ | atrā śivāṃ tanvo dhāsim asyā jarāṃ cin me nirṛtir jagrasīta ||

Hence, the Biblical character Jesus Christ might not have emanated from the word शिव - śiva.

However, the word Jesus might have emanated from the word ईश् - īś - master/ruler, which was also used in Rig Veda. For example: Rig Veda 4.20.8.

īkṣe rāyaḥ kṣayasya carṣaṇīnām uta vrajam apavartāsi gonām | śikṣānaraḥ samitheṣu prahāvān vasvo rāśim abhinetāsi bhūrim ||

īkṣe < īś - govern; command; master; dominate; can; reign; control; own.

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“Isah" is a name with religious and linguistic roots, most commonly a variant of Isa (Jesus in Arabic and Islamic tradition), meaning "God saves" or "salvation". It is also a variant of Isiah, a masculine name of Hebrew origin which translates to "Yahweh is salvation". The name has significant religious importance, referring to a prophet of God in Islamic tradition and carrying a meaning of salvation.

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Isaiah  "Yahweh is salvation" also known as Isaias or Esaias from Greek was the 8th-century BC Israelite prophet after whom the Book of Isaiah is named.

The text of the Book of Isaiah refers to Isaiah as "the prophet", but the exact relationship between the Book of Isaiah and the actual prophet Isaiah is complicated. The traditional view is that all 66 chapters of the book of Isaiah were written by one man, Isaiah, possibly in two periods between 740 BC and c. 686 BC, separated by approximately 15 years.

Another widely held view suggests that parts of the first half of the book (chapters 1–39) originated with the historical prophet, interspersed with prose commentaries written in the time of King Josiah 100 years later, and that the remainder of the book dates from immediately before and immediately after the end of the 6th-century BC exile in Babylon (almost two centuries after the time of the historical prophet), and that perhaps these later chapters represent the work of an ongoing school of prophets who prophesied in accordance with his prophecies 

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The concepts of Rig Veda might have travelled westward from the then India and hence the usage of the word ईश् - īś might have started there. 

 The prophet Isaiah might have been a Rig Vedic scholar, who could have spread the Rig Vedic knowledge of BRAHMAN, SELF -REALISATION in Western World.