Alexander - The first segment comes from the verb (alexo), meaning to ward or keep off, turn away or aside (Liddell and Scott - An Intermediate Greek-English Lexicon). The second part of the name Alexander comes from the common Greek word (andros), meaning of man. A similar but more general word is (anthropoktonos) meaning manslayer or rather human-slayer (John 8:44).
Desmond - From an Irish surname which was derived from Gaelic Deas-Mhumhan meaning "from south Munster (in Ireland)". The name derived from the rebellions in the 1500's by the Earl of Desmond and his allies agains the threat of extension of the English government over the province. The rebellions were motivated primarily by the desire to maintain the independence of lords from their monarch, but also had an element of religious antagonism between Catholic Geraldines and the Protestant English state. The result was the destruction of the Desmond dynasty and the subsequent plantation or colonisation of Munster with English settlers. 'Desmond' is the Anglicisation given to the Irish Deasmumhain, which translates to 'South Munster'.
Micah - The name Mica(h) consists of two parts. The first bit is (mi), the common inquisitive particle that seeks after identity: who? For Micah the second part of the name is , which is equal to the word (koh), the demonstrative adverb of manner, place or time: thus, here, making Micah to mean Who's There? For a meaning of the name Micha(h), NOBS Study Bible Name List reads Who Is Like Yahweh? Jones' Dictionary of Old Testament Proper Names reads a rather enigmatic Who Is Like Unto The Lord?
Nathan - The name Nathan comes from the verb (natan), to give. The name Nathan doesn't seem to denote something that is given (as NOBS Study Bible Name List suggests with the meaning of Gift), but rather an active form of the verb: He Will Give. Jones' Dictionary of Old Testament Proper Names reads Given.
Sandra - Short form of ALESSANDRA which is the Italian form of ALEXANDRA which is the feminine form of ALEXANDER. (See above)
Anastacia - Variant of ANASTASIA which is the feminine form of ANASTASIUS which is the
Latinized form of the Greek name Αναστασιος (Anastasios) which meant "resurrection" from Greek αναστασις (anastasis) (composed of the elements ανα (ana) "up" and στασις (stasis) "standing"). This was the name of numerous early saints and martyrs, including a 7th-century monk and writer from Alexandria who is especially venerated in the Eastern Church.
Rebecca - The name Rebekah comes from the unused verb (rbq), meaning to tie firmly. Jones' Dictionary of Old Testament Proper Names quotes Gesenius who suggests that this name denotes a woman who ensnares a man with her beauty. But although the Biblical occurrence of this name has to do with a lot, not with the snaring of a man by beauty. The name denotes merely a tying up of cattle, both for their own protection, the establishment of their home and to keep them from wandering off. Within this name lies the notion that individuals are placed together by something higher or smarter than they. The name Rebekah literally means Tied Up but more specific (and more friendly) is Secured.
Vanessa - Invented by author Jonathan Swift for his poem 'Cadenus and Vanessa' (1726). He arrived at it by rearranging the initial syllables of the first name and surname of Esther Vanhomrigh, his close friend. Vanessa was later used as the name of a genus of butterfly.