Where does “Lethe” come from?

Lethe (German) comes from Latin Lēthē, from Ancient Greek Λήθη, from Proto-Hellenic lā́tʰā, from Proto-Indo-European léh₂dʰeh₂, from Proto-Indo-European leh₂- — to bark, howl; to be concealed.

Lethe (German): Lethe

Definitions

Lethe

Ancestry of “Lethe”, step by step

Step	Language	Word	Meaning
1	Latin	Lēthē	the river Lethe, the river of oblivion
2	Ancient Greek	Λήθη	forgetfulness
3	Proto-Hellenic	lā́tʰā	—
4	Proto-Indo-European	léh₂dʰeh₂	—
5	Proto-Indo-European	leh₂-	to bark, howl; to be concealed

Every word from Proto-Indo-European leh₂- →Every word from Proto-Indo-European léh₂dʰeh₂ →Every word from Proto-Hellenic lā́tʰā →