Shambhu is modified word from Swayam bhu which means "Self Born" and is another name of Brahman or Purush from Upanishads. No other Deity is called Shambhu or has a Nirakaar form like Shiva Lingam. Does it mean, what I am thinking
From Isha Upanishad
That soul is the ultimate radiant, devoid of body, unmanifest, idle, pure, good-natured-natureless, all-knowing, omniscient, excellent and self-born(Swayam bhu). He has been creating and distributing all the meanings since time immemorial
वह आत्मा परम तेजोमय, शरीरों से रहित, अक्षत, स्नायु से रहित, शुद्ध, शुभाशुभकर्म-सम्पर्कशून्य, सर्वद्रष्टा, सर्वज्ञ, सर्वोत्कृष्ट और स्वयंभू है । वही अनादि काल से सब अर्थों की रचना और विभाग करता आया है

Does it mean, what I am thinkingI think you meanDoes shambhu come from "Swayam"+"bhu" and therefore also have the meaning of "self-born?". If this is the case, you should reword your question. As it stands it can easily be interpreted to meanshambhu comes from "Swayam"+"bhu." Does this imply what I think it does?without you explaining the implication you are thinking. If you mean the second scenario, you should also reword it to prevent misinterpretations. However, if you do mean the second case, then you'll need to re-rewrite it to explain what implication you have in mind. – Rubellite Yakṣī Oct 15 '18 at 19:10