The Vajra Sutra says, “The Tathāgata does not come from anywhere, nor does he go anywhere. Therefore, he is called the Tathāgata.” (VS 147)

One who seeks me in forms
Or seeks me in sounds
Practices a deviant way
And cannot see the Thus Come One. (VS 141)

The title Thus Come One refers to a Buddha’s Dharma body (three bodies of a buddha). The Buddha’s transformation bodies come and go, but his Dharma body does not. Maitreya Bodhisattva spoke this verse:

“What comes and goes are the Buddha’s transformation bodies.
The Tathāgata is eternally unmoving.
He is neither the same nor different from every place within the Dharma Realm."

“You should know that it is not the Tathāgata who comes and goes; rather the distinctions of our eighth consciousness perceive a coming and a going. When the Vajra Sutra tells you not to consider the Buddha as either sitting, lying, coming, or going, it is telling you not to make such distinctions. When you no longer make distinctions, your wisdom can appear.…” (VS 149)

如來 ; Tathāgata

Can mean both ‘thus come’ and 'thus gone.'