Commonly vs Usual - What's the difference?

As an adverb commonly

is as a rule; frequently; usually.

most commonly occurring.

(en adverb)

as a rule; frequently; usually

(obsolete) in common; familiarly

(Spenser)

(en adjective)

most commonly occurring

The preference of a boy to a girl is a usual occurrence in some parts of China.

It is becoming more usual these days to rear children as bilingual.

* common, wonted, normal, standard, regular, ordinary, plain, simple

* unusual

* usualness * usually * unusual * as usual

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