Where does “-amhail” come from?

-amhail (Middle Irish) comes from Old Irish -amail, from Old Irish amail, from Old Irish samail, from Proto-Celtic samalis, from Proto-Indo-European sem- — together, one.

Ancestry of “-amhail”, step by step

Step	Language	Word	Meaning
1	Old Irish	-amail	-like
2	Old Irish	amail	Alternative form of amal; like, as
3	Old Irish	samail	verbal noun of samlaidir; likeness, similarity;...
4	Proto-Celtic	samalis	similitude, description
5	Proto-Indo-European	sem-	together, one

Words derived from “-amhail”

-ail

Every word from Proto-Indo-European sem- →Every word from Proto-Celtic samalis →Every word from Old Irish samail →