The Spanish verb 'soler' comes directly from the Latin verb 'solere', meaning 'to be accustomed to'. This verb has maintained remarkably consistent meaning and usage from Latin to modern Spanish, where it is still used to express habitual actions or customs.

'Soler' is a relatively unique verb in Spanish and doesn't have many common etymologically related words in modern Spanish. It's most commonly used in its conjugated forms like 'suelo', 'sueles', 'suele' to express habitual actions.

While English doesn't have any common words directly related to 'soler', the concept is typically expressed using phrases like 'used to' or 'tend to'. The closest etymologically related English word might be 'insolent', which comes from Latin 'in-' (not) + 'solens' (accustomed), literally meaning 'not accustomed' or 'unusual', though this connection is quite distant and the meaning has shifted significantly.