Sceafthere: unknown king but his name means 'spear-army (compare with Rondhere, 'shield-army).
Ymbran: An unknown tribe
Sceafa: A king of the Langobards but Price 1826 identified him as the mythical 'Scef', father of the equally mythical 'Scyld Scefing'. Malone rejects this association because Scyld was, of course, mythical.
Longbeardan: the Langobards of history. Originating in Scandinavia, this tribe migrated south and settled in the region of Lombardy. The name presumably comes from the words meaning 'long beards'. Wikipedia