{But Saul, who is also called Paul} (Saulos de, ho kai
Paulos). By this remarkably brief phrase Luke presents this
epoch in the life of Saul Paul. The "also" (kai) does not mean
that the name Paul was given now for the first time, rather than
he had always had it. As a Jew and a Roman citizen, he
undoubtedly had both names all the time (cf. John Mark, Symeon
Niger, Barsabbas Justus). Jerome held that the name of Sergius
Paulus was adopted by Saul because of his conversion at this
time, but this is a wholly unlikely explanation, "an element of
vulgarity impossible to St. Paul " (Farrar). Augustine thought
that the meaning of the Latin _paulus_ (little) would incline
Saul to adopt, "but as a proper name the word rather suggested
the glories of the Aemilian family, and even to us recalls the
name of another Paulus, who was 'lavish of his noble life'"
(Page). Among the Jews the name Saul was naturally used up to
this point, but from now on Luke employs Paul save when there is
a reference to his previous life ( Ac 22:7  26:14 ). His real
career is work among the Gentiles and Paul is the name used by
them. There is a striking similarity in sound between the Hebrew
Saul and the Roman Paul. Paul was proud of his tribe of Benjamin
and so of King Saul ( Php 3:5 ). {Filled with the Holy Spirit}
(pl(8873)theis pneumatos hagiou). First aorist (ingressive) passive
participle of pimpl(886d)i with the genitive case. A special influx
of power to meet this emergency. Here was a cultured heathen,
typical of the best in Roman life, who called forth all the
powers of Paul plus the special help of the Holy Spirit to expose
the wickedness of Elymas Barjesus. If one wonders why the Holy
Spirit filled Paul for this emergency rather than Barnabas, when
Barnabas was named first in  13:2 , he can recall the sovereignty
of the Holy Spirit in his choice of agents ( 1Co 12:4-11 ) and
also the special call of Paul by Christ ( Ac 9:15  26:17f. ).
{Fastened his eyes} (atenisas). As already in  Lu 4:20  22:56  Ac 3:4,12  6:15  10:4 .