This article covers both the Arabic jins and Queen and maqam called "Saba" as well as the similar Turkish makam of the same name.
[2]: 45 It is possible the connection with the Turkish word for morning is simply folk etymology and the name of the scale comes from Arabic.
Jins Saba is traditionally defined as a tetrachord spanning an interval significantly less than a perfect fourth.
[1]: 223 Saba is not playable on equal-tempered Western instruments because of the second degree, which is conceptually a "quarter tone" and not sufficiently well approximated by either a minor second or a major second above the tonic.
Jins 'Ajam may make more sense to Western ears because its third note is the same as the octave of the Saba tonic.
[3]: 196 [2]: 45 Multiple sources agree that the fourth degree, the pitch called Hicaz, is in practice played somewhat sharper than notated.