martyrdom, follow by resigning
殉 centers on dying or sacrificing oneself for a cause or person: martyrdom, or following someone even into death. The idea of resigning oneself to follow a doomed path extends naturally from that self-sacrifice.
殉 combines 歹 (death) with 旬, which likely contributes the sound and may relate to following or a period of time, suggesting dying in the same period as one's lord or cause.
The death radical 歹 beside 旬 (a ten-day period) suggests a follower dying within the same time frame as their master. Picture a loyal retainer choosing death alongside their lord: that is martyrdom.
For ジュン, imagine a martyr named June who sacrifices herself in June: June -> ジュン, and her martyrdom is remembered every June.
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martyr
dying at one's post; being killed in the line of duty
martyrdom
following one's master into the grave; committing suicide after one's lord has died
martyrdom
to sacrifice oneself; to die a martyr
to sacrifice oneself; to die a martyr
dying for one's country
person who has died at his post (in the performance of his duties)
victim; martyr