Vasudeva means
Srimad-Bhagavatam
SB Canto 4
In pure devotional service one simply serves the Supreme Personality of Godhead as a matter of duty, without reason and without being impeded by material conditions. That is called śuddha-sattva, or vasudeva, because in that stage the Supreme Person, Kṛṣṇa, is revealed in the heart of the devotee. Śrīla Jīva Gosvāmī has very nicely described this vasudeva, or śuddha-sattva, in his Bhagavat-sandarbha. He explains that aṣṭottara-śata (108) is added to the name of the spiritual master to indicate one who is situated in śuddha-sattva, or in the transcendental state of vasudeva. The word vasudeva is also used for other purposes. For example, vasudeva also means one who is everywhere, or all-pervading. The sun is also called vasudeva-śabditam. The word vasudeva may be utilized for different purposes, but whatever purpose we adopt, Vāsudeva means the all-pervading or localized Supreme Personality of Godhead. In Bhagavad-gītā (7.19) it is also stated, vāsudevaḥ sarvam iti. Factual realization is to understand Vāsudeva, the Supreme Personality of Godhead, and surrender unto Him. Vasudeva is the ground wherein Vāsudeva, the Supreme Personality of Godhead, is revealed. When one is free from the contamination of material nature and is situated in pure Kṛṣṇa consciousness, or in the vasudeva state, Vāsudeva, the Supreme Person, is revealed. This state is also called kaivalya, which means "pure consciousness." Jñānaṁ sāttvikaṁ kaivalyam. When one is situated in pure, transcendental knowledge, one is situated in kaivalya. Therefore vasudeva also means kaivalya, a word which is generally used by impersonalists. Impersonal kaivalya is not the last stage of realization, but in Kṛṣṇa consciousness kaivalya, when one understands the Supreme Personality of Godhead, then one is successful. In that pure state, by hearing, chanting, remembering, etc., because of the development of knowledge of the science of Kṛṣṇa, one can understand the Supreme Personality of Godhead. All these activities are under the guidance of the internal energy of the Supreme Lord.