Some Kyrgyz personal names have particles associated with them, and the names are in a different order. For example,

The uulu is similar to oghlu, which means son of.
In this case, uulu is a particle attached to the surname, and the heading becomes:

100 20 Esen uulu, Kylych.

A quick search should be made for the Russianized form of the name, here: Gasanov.

References

Do not make a reference from uulu, but in some cases, a direct order reference is made:

NAFL944136