Especially means more than in any other case. Especially good, especially the young, especially in winter.
It singles one thing out of several for extra weight. Specially means for a particular purpose — made specially for you — and the two are constantly swapped, which usually causes no confusion and occasionally does. Note special, and that especially cannot begin a sentence in careful writing.
1adverbespeciallyMore than in any other case.
“I love all fruit, especially strawberries in summer.”
especially is a marker of emphasis.
From especial + -ly.
Etymology from Wiktionary, CC BY-SA