[student], late 14c., "orphan child, ward, person under the care of a guardian," from Old French pupille (14c.) and directly from Latin pupillus (fem. pupilla) "orphan child, ward, minor," diminutive of pupus "boy" (fem. pupa "girl"), probably related to puer "child" (and thus probably from a suffixed form of PIE root *pau- (1) "few, little").
Meaning "disciple, student youth or any person of either sex under the care of an instructor or tutor" is recorded by 1560s. Related: Pupillary; pupillarity; pupillage.
Abraham-man was an old term for mendicant lunatics, or, more commonly, frauds who wandered England shamming madness so as to collect alms (1560s). According to the old explanation of the name (from at least 1640s), they originally were from Bethlehem Hospital, where in early times there was an Abraham ward or room for such persons, but the ward might have been named for the beggars.