Jacobowitz means "Son of Jacob," which makes it a common name since many fathers are named Jacob/Yakub.
Find a basic discussion of patronymics at http://www.jewfaq.org/jnames.htm
There are lots of variants. (Please add some more)
- Jacobowitz
- Jakubovics
- Jakubovic
- Jakubovisc
- Jakubovitsch
- Yakubovitz
- יאַקאַבאַוויץ
- בן יעקב
- Jacobs
- Jacobus
- Jacoby
- Jacobi
- Bar Yakov
- Jacobson
- Jacobsen
- Jackson