piano chord
G♭sus4
G♭1C♭4D♭5
The third replaced by the fourth, which leans on the third it is standing in for.
Written the other way round it is F♯sus4 — the same twelve keys on a piano, a different piece of notation.
What is true of it
G♭sus4 is G♭, C♭ and D♭ — 1, 4 and 5 counted from G♭.
These are also the notes of Bsus2/G♭. Which name is right depends on what is underneath and what came before — the notes alone do not decide.