An Etymological Dictionary of the German Language/Annotated/Seim
Seim, masculine, ‘strained honey, sweetness,’ from Middle High German seim (honecseim), Old High German seim (honangseim), masculine, ‘virgin honey’; compare Dutch zeem; Old Icelandic seimr, hunangsseimr, ‘honeycomb.’ On account of this divergence of meaning in Teutonic the connection of the word with Greek αἰμα, ‘blood’ (literally ‘juice’?), is improbable. It may be allied to the cognates discussed under Seihe.