What is the meaning of Allen?

personal plural of alle (“all”)

accusative singular masculine of alles (“all”)

dative plural of alles (“all”)

Genitive singular masculine and neutral gender forms of alles ("all") for strong Substantives.

suppletive plural of tiṭ

inflection of al:

1. strong masculine accusative singular
2. strong dative plural
3. weak genitive/dative singular
4. weak masculine/feminine accusative singular
5. weak plural

strong masculine accusative singular

strong dative plural

weak genitive/dative singular

weak masculine/feminine accusative singular

weak plural

soft mutation of gallen

Source: wiktionary.org