It's a pun from Japanese (and also in English)
Egghead means bald person, but can also refer to a scholar
And in Japanese, Egghead translates to インテリ (Katakana for "intelligent", but shortened to intelli)
Of course refering to Vegapunk being intelligent
If Vegapunk really is bald, I guess not, but it also reminds me of Dr. Eggman from Sonic