english: Not because it's crazy, or anything, but because the fractions are ratios of whole numbers, and so are called rationals; meaning the rest are non-rational, that is, irrational.
non_english: Ne jer je lud ili nešto tako, već zato što su razlomci delovi celih brojeva i zato su nazvani "racionalni"; što znači da je ostatak ne-racionalan, odnosno, "iracionalan".