Where does “Äisbierg” come from?

Äisbierg (Luxembourgish) comes from German Eisberg, from Dutch ijsberg, from Dutch ĳs, from Middle Dutch ĳs, from Old Dutch īs, from Proto-West Germanic īs, from Proto-Germanic īsą, from Proto-Indo-European h₁eyH- — ice, frost.

Äisbierg (Luxembourgish): iceberg

Definitions

iceberg

Ancestry of “Äisbierg”, step by step

Step	Language	Word	Meaning
1	German	Eisberg	iceberg
2	Dutch	ijsberg	iceberg
3	Dutch	ĳs	ice frozen liquid, notably water
4	Middle Dutch	ĳs	ice
5	Old Dutch	īs	—
6	Proto-West Germanic	īs	ice
7	Proto-Germanic	īsą	ice
8	Proto-Indo-European	h₁eyH-	ice, frost

Every word from Proto-Indo-European h₁eyH- →Every word from Proto-Germanic īsą →Every word from Proto-West Germanic īs →