Only indirectly. When INT Is Less than or equal to the Enemy's INT Plus 10, 1INT on the player = 1MACC. When INT is Greater than the Enemy's INT Plus 10, 1INT = .5MACC. Or so conventional wisdom would hold. I certainly haven't done all the mathematical work, but these are what most players tend to abide by. INT has no direct impact on Potency. The work on the same resist level as Magic attacks, where a 1/2 resist would be Half time, and it gets worse from there.
Priority for these debuffs should be.
1.Skill
2.Skill
3.Skill
4.Skill
5.Skill
6.Magic Accuracy.**
7.INT
**A little clarification. 1Skill = 1Magic accuracy, so if the value's are equal on two pieces of equipment, it doesn't tend to matter which you choose. This is most of note on something like Goliard Clogs, so compare carefully. Generally Magic Accuracy isn't pervasive enough on equipment to merit a warning, however this is the most likely example you will come across.
***Ah yes, I almost forgot, when dealing with White Magic Enfeebles (Repose, ect) MND is substituted for INT in the Calculations, I believe this is the same with Bard Songs and CHR, though I'm not sure.