At last count. Jupiter had 16 moons:
Name............Distance in KM.,,,....Size.....Orbit Inclination Adrastea 127,000 13 -- Metis 129,000 20 -- Amalthea 180,000 70 0.4 Thebe 222,000 55 0.8 Io 422,000 1815 0.0 Europa 671,000 1569 0.5 Ganymede 1,070,000 2631 0.2 Callisto 1,883,000 2400 0.5 Leda 11,094,000 8 26.1 Himalia 11,480,000 90 27.6 Lysithea 11,720,000 20 29.0 Elara 11,740,000 40 24.8 Ananke 21,200,000 15 147 Carme 22,600,000 20 164 Pasiphae 23,500,000 20 145 Sinope 23,700,000 20 153The inner 8 satellites have very low inclination, planar, orbits and are thought to have formed out of the orbiting accretion disk that fed the formation of Jupiter itself, 4 billion years ago. There is a big gap in distances between these satellites and the outer families beginning with Leda at 11 million miles from Jupiter. These are thought to, possibly, form two groups including captured asteroids from the asteroid belt, or passing cometary bodies from perhaps the outer solar system on the basis of the abrupt change in the orbital inclinations of the inner ( 27 degree) and outer ( 160 degree) groupings.