Why? My Dad hated the sound of Jr and insisted on II on my birth certificate.
That explains alot, two peas in a pod.
Actually II is not commonly used, apparently one of several exceptions is by those afraid of their offspring being referrred to as sissy and weak etc by using Junior, go ahead google it. Barack sure is a sissy and IMO gay or bisexual. No implication towards you in reference to the latter meant.
“Actually II is not commonly used...”
May be regional. I’ve met a number of IIs, and yet to meet a Jr. I doubt my Dad ‘googled’ anything in the late 50s...just did what he thought best.