Hallam comes from an English surname, a locational name via Old English halh, healh meaning “corner, angle; nook, recess”; it may also originate from Old Norse hallr “rock, stone; slope, hill” via Proto-Germanic *halluz (rock; stone) via a PIE root word.
Meaning: “corner; nook, recess” or “rock, stone; slope”
Alanis is a feminine form of Alan, a name of uncertain etymology and meaning. It comes from an old Breton name, brought to England by the Normans. It could have originated from the name of a Celtic god, Alaunus, a god of healing and prophecy. The name may possibly be derived from Proto-Celtic *aleti (to grow, nourish) via PIE root word *h₂el- (to grow, nourish).
Another possible meaning behind the name is “little rock” via Old Irish ail (rock, boulder) combined with the diminutive suffix -an; or possibly meaning “handsome” via Old Irish álaind (beautiful; lovely, fine, splendid).
Incidentally, the Alans (Alani in Latin) is the name of an Iranian nomadic tribe in the north area of the Caucasus. In this case, the name seems to have originated as a dialectal form of Old Iranian *aryana <aryan, used to refer to the Indo-Iranian people, which derives from the root word arya (noble), which ultimately derives from a Proto-Indo-Iranian source. It could be possible the name Alan is based from this.
Alanis is also a Spanish and Portuguese surname (spelled Alanís), a locational name for someone who came from Alanís, Seville. It seems the name derives from an Arabic origin but I could not find an exact meaning behind the name.
Origin: uncertain; Proto-Indo-Iranian; Arabic
Meaning: uncertain though it could be related to the name of a Celtic deity “to grow, nourish”; possibly “little rock” or “handsome”; “noble”; also a Spanish and Portuguese surname
Thurstan comes from an English surname, an Anglicized form of Old Norse Þorsteinn (Torsten) meaning “Thor’s stone”, made up of Thor (the Norse god of thunder, strength, war, and storms) and Old Norse steinn (stone), perhaps originating as a locational name for someone who lived near an altar for Thor.
Mason originated as an English surname, an occupational name for a stonemason, someone who worked with stone. Masons were highly skilled craftsmen, responsible for the creation of thousands of buildings, castles, and churches, and stonemasonry was an important craft during the Middle Ages.
The word comes from Middle English masoun via Anglo-Norman masson, maçon (mason; builder) which may be derived from Frankish *makjōn (to build, work, make) via PIE *mag– (to knead, mix, make).