These are the sons
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of Ishmael
Yishma`e'l (yish-maw-ale')
God will hear; Jishmael, the name of Abraham's oldest son, and of five Israelites -- Ishmael.
and these are their names
shem (shame)
an appellation, as a mark or memorial of individuality; by implication honor, authority, character -- + base, (in-)fame(-ous), named(-d), renown, report.
by their towns
chatser (khaw-tsare')
a yard (as inclosed by a fence); also a hamlet (as similarly surrounded with walls) -- court, tower, village.
and by their castles
tiyrah (tee-raw')
a wall; hence, a fortress or a hamlet -- (goodly) castle, habitation, palace, row.
twelve
shnayim (shen-ah'-yim)
two; also (as ordinal) twofold -- both, couple, double, second, twain, + twelfth, + twelve, + twenty (sixscore) thousand, twice, two.
`asar (aw-sawr')
ten (only in combination), i.e. -teen; also (ordinal) -teenth -- (eigh-, fif-, four-, nine-, seven-, six-, thir-)teen(-th), + eleven(-th), + sixscore thousand, + twelve(-th).
princes
nasiy' (naw-see')
an exalted one, i.e. a king or sheik; also a rising mist -- captain, chief, cloud, governor, prince, ruler, vapour.
according to their nations
'ummah (oom-maw')
a collection, i.e. community of persons -- nation, people.
