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Seby. Seb.
My name is Sebastian so I've always had a nickname.. if I introduce myself as Sebastian 98% of the time they imidietly call me Seb.
My sister called me seby when I was 10 and it just stuck and family/friends call me seby 100% of the time since.
My old boss was Persian and they tend to use shorted names "shabazmahat" would be "shabaz" so his brother called be "sebast" weird but kinda interesting.