Affixes to Hoklo names

http://www.taipeitimes.com/News/editorials/archives/2014/10/07/2003601465

there are some affixes to Hoklo names, such as tor (堵), that often appear in names of places along rivers and are often preceded by numbers.

• Sirtor (四堵): Sinpag Chi, Pvinaa Khw
• Goxtor (五堵): Køelaang & Taipag
• Lagtor (六堵): borough of Køelaang, Chittor Khw
• Chittor (七堵): Køelaang
• Pøehtor (八堵): Køelaang, Loafnloarn Khw

are some, but nobody seems to be able to accurately explain what to means.